= Changelog for VirtualBox 4.2 =

This page lists all changes of the !VirtualBox 4.2 '''[wiki:Downloads releases]'''.[[BR]]
All branches: [wiki:Changelog 4.3] · [wiki:Changelog-4.2 4.2] · [wiki:Changelog-4.1 4.1] · [wiki:Changelog-4.0 4.0] · [wiki:Changelog-3.2 3.2] · [wiki:Changelog-3.1 3.1] · [wiki:Changelog-3.0 3.0] · [wiki:Changelog-2.2 2.2] · [wiki:Changelog-2.1 2.1] · [wiki:Changelog-2.0 2.0] · [wiki:Changelog-1.6 1.6]

'''!VirtualBox 4.2.18''' (released 2013-09-06)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: properly handle NMIs on Linux hosts with X2APIC enabled
 * VMM: fixed potential crashes with 64-bit guests on 32-bit hosts (bug #11979)
 * GUI / seamless: properly handle mouse wheel scroll events
 * GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which are used exclusively (bug #10311)
 * GUI: prevent crashes under certain conditions on X11 hosts
 * 3D: multiscreen fixes (incorrect mouse position, flickers)
 * 3D Support: several fixes for the Windows WDDM video driver (multiscreen, seamless)
 * Snapshots: made live snapshots work again (bug #9255)
 * Teleportation: made it work again (bug #9455)
 * VBoxManage: on snapshot take,  --pause is default and --live is for doing live snapshots
 * VBoxSVC: don't crash on systems with many VLAN interfaces (Solaris hosts only)
 * Network: after the host resumes from suspend, disconnect and reconnect the virtual network cables to force renewing the DHCP leases for the guests. So far only Mac OS X hosts and Windows hosts (bug #10063).
 * NAT: on name server changes force a reconnect of the virtual network cable to notify the guest (Mac OS X hosts only)
 * Mac OS X installer: keep previously installed Extension Packs on !VirtualBox upgrade
 * Linux hosts / guests: Linux 3.11 fixes (bug #12001)
 * Solaris hosts: fixed a potential kernel panic caused due to unexpected preemption due to logging.
 * Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into USB3 ports.
 * Linux Additions: added PCI device identifier to vboxvideo.ko fixing DRI initialization under certain conditions (bug #11957)
 * Linux Additions: fixed udev detection in the init script with Linux 3.x kernels

'''!VirtualBox 4.2.16''' (released 2013-07-04)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * OVF/OVA: don't crash on import if no manifest is used (4.2.14 regression; bug #11895)
 * GUI: do not restore the current snapshot if we power-off after a Guru Mediation
 * Storage: fixed a crash when hotplugging an empty DVD drive to the VM
 * Storage: fixed a crash when a guest read from a DVD drive attached to the SATA controller under certain circumstances
 * EFI: don't fail with 64-bit guests on 32-bit hosts (bug #11456)
 * Autostart: fixed VM startup on OS X
 * Windows hosts: native Windows 8 controls
 * Windows hosts: restore native style on Vista 32
 * Windows hosts / guests: Windows 8.1 adaptions (bug #11899)
 * Mac OS X hosts: after removing !VirtualBox with ''!VirtualBox_Uninstall.tool'', remove it from the ''pkgutil --pkgs'' list as well

'''!VirtualBox 4.2.14''' (released 2013-06-21)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: another TLB invalidation fix for non-present pages
 * VMM: fixed a performance regression (4.2.8 regression; bug #11674)
 * GUI: fixed a crash on shutdown
 * GUI: prevent stuck keys under certain conditions on Windows hosts (bugs #2613, #6171)
 * VRDP: fixed a rare crash on the guest screen resize
 * VRDP: allow to change VRDP parameters (including enabling/disabling the server) if the VM is paused
 * USB: fixed passing through devices on Mac OS X host to a VM with 2 or more virtual CPUs (bug #7462)
 * USB: fixed hang during isochronous transfer with certain devices (4.1 regression; Windows hosts only; bug #11839)
 * USB: properly handle orphaned URBs (bug #11207)
 * BIOS: fixed function for returning the PCI interrupt routing table (fixes NetWare 6.x guests)
 * BIOS: don't use the ''ENTER'' / ''LEAVE'' instructions in the BIOS as these don't work in the real mode as set up by certain guests (e.g. Plan 9 and QNX 4)
 * DMI: allow to configure DmiChassisType (bug #11832)
 * Storage: fixed lost writes if iSCSI is used with snapshots and asynchronous I/O (bug #11479)
 * Storage: fixed accessing certain VHDX images created by Windows 8 (bug #11502)
 * Storage: fixed hang when creating a snapshot using Parallels disk images (bug #9617)
 * 3D: seamless + 3D fixes (bug #11723)
 * 3D: version 4.2.12 was not able to read saved states of older versions under certain conditions (bug #11718)
 * Main/Properties: don't create a guest property for non-running VMs if the property does not exist and is about to be removed (bug #11765)
 * Main/Properties: don't forget to make new guest properties persistent after the VM was terminated (bug #11719)
 * Main/Display: don't lose seamless regions during screen resize
 * Main/OVF: don't crash during import if the client forgot to call Appliance::interpret() (bug #10845)
 * Main/OVF: don't create invalid appliances by stripping the file name if the VM name is very long (bug #11814)
 * Main/OVF: don't fail if the appliance contains multiple file references (bug #10689)
 * Main/Metrics: fixed Solaris file descriptor leak
 * Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes
 * VBoxManage: fixed setting the parent UUID on diff images using ''sethdparentuuid''
 * Linux hosts: work around for not crashing as a result of automatic NUMA balancing which was introduced in Linux 3.8 (bug #11610)
 * Windows installer: force the installation of the public certificate in background (i.e. completely prevent user interaction) if the --silent command line option is specified
 * Windows Additions: fixed problems with partial install in the unattended case
 * Windows Additions: fixed display glitch with the Start button in seamless mode for some themes
 * Windows Additions: Seamless mode and auto-resize fixes
 * Windows Additions: fixed trying to to retrieve new auto-logon credentials if current ones were not processed yet
 * Windows Additions installer: added the ''/with_wddm'' switch to select the experimental WDDM driver by default
 * Linux Additions: fixed setting own timed out and aborted texts in information label of the lightdm greeter
 * Linux Additions: fixed compilation against Linux 3.2.0 Ubuntu kernels (4.2.12 regression as a side effect of the Debian kernel build fix; bug #11709)
 * X11 Additions: reduced the CPU load of VBoxClient in drag'and'drop mode
 * OS/2 Additions: made the mouse wheel work (bug #6793)
 * Guest Additions: fixed problems copying and pasting between two guests on an X11 host (bug #11792)

'''!VirtualBox 4.2.12''' (released 2013-04-12)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: fixed a Guru Meditation on putting Linux guest CPU online if nested paging is disabled
 * VMM: invalidate TLB entries even for non-present pages
 * GUI: Multi-screen support: fixed a crash on visual-mode change
 * GUI: Multi-screen support: disabled guest-screens should now remain disabled on visual-mode change
 * GUI: Multi-screen support: handle host/guest screen plugging/unplugging in different visual-modes
 * GUI: Multi-screen support: seamless mode: fixed a bug when empty seamless screens were represented by fullscreen windows
 * GUI: Multi-screen support: each machine window in multi-screen configuration should have correct menu-bar now (Mac OS X hosts)
 * GUI: Multi-screen support: machine window View menu should have correct content in seamless/fullscreen mode now (Mac OS X hosts)
 * GUI: VM manager: vertical scroll-bars should be now updated on content/window resize
 * GUI: VM settings: fixed crash on machine state-change event
 * GUI: don't show warnings about enabled or disabled mouse integration if the VM was restored from a saved state
 * Virtio-net: properly announce that the guest has to handle partial TCP checksums (bug #9380)
 * Storage: Fixed incorrect alignment of VDI images causing disk size changes when using snapshots (bug #11597)
 * Audio: fixed broken ALSA & !PulseAudio on some Linux hosts due to invalid symbol resolution (bug #11615)
 * PS/2 keyboard: re-apply keyboard repeat delay and rate after a VM was restored from a saved state (bug #10933)
 * BIOS: updated DMI processor information table (type 4): corrected L1 & L2 cache table handles
 * Timekeeping: fix several issues which can lead to incorrect time, Solaris guests sporadically showed time going briefly back to Jan 1 1970
 * Main/Metrics: disk metrics are collected properly when software RAID, symbolic links or rootfs are used on Linux hosts
 * VBoxManage: don't stay paused after a snapshot was created and the VM was running before
 * VBoxManage: introduced ''controlvm nicpromisc'' (bug #11423)
 * VBoxManage: don't crash on ''controlvm guestmemoryballoon'' if the VM isn't running (bug #11639)
 * VBoxHeadless: don't filter guest property events as this would affect all clients (bug #11644)
 * Guest control: prevent double CR in the output generated by guest commands and do NLS conversion
 * Linux hosts / guests: fixed build errors on Linux 3.5 and newer kernels if the ''CONFIG_UIDGID_STRICT_TYPE_CHECKS'' config option is enabled (bug #11664)
 * Linux Additions: handle fall-back to VESA driver on RedHat-based guests if vboxvideo cannot be loaded
 * Linux Additions: RHEL/OEL/CentOS 6.4 compile fix (bug #11586)
 * Linux Additions: Debian Linux kernel 3.2.0-4 (3.2.39) compile fix (bug #11634)
 * Linux Additions: added auto-logon support for Linux guests using LightDM as the display manager
 * Windows Additions: Support for multimonitor. Dynamic enable/disable of secondary virtual monitors. Support for XPDM/WDDM based guests
 * X11 Additions: support X.Org Server 1.14 (bug #11609)

'''!VirtualBox 4.2.10''' (released 2013-03-15)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * GUI: fixed keyboard with XQuartz X server (bug #10664)
 * Main/Display: fixed a crash with multi-monitors under certain conditions (Mac OS X hosts only)
 * Main/Properties: fixed a crash under certain conditions, for example after wakeup from host hibernate (bug #11444)
 * Settings: don't lose the internal network settings if they are not currently active
 * Storage: another incompatibility fix for VHD differencing images with Hyper-V (bug #5990)
 * VBoxManage: don't read beyond the end of the file specified with ''export --eulafile'' (bug #11528)
 * Linux hosts / guests: Linux 3.9-rc0 compile fixes (bug #11529)
 * Linux Additions: fixed two warnings in the shared folders guest kernel module (bug #11390)
 * Linux Additions: don't crash VBoxService if libdbus is not available (bug #8638)
 * Windows Additions: fixed upgrading MultiMedia Redirection (MMR) support

'''!VirtualBox 4.2.8''' (released 2013-02-27)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: fixed guest crash with huge amount of guest RAM on VT-x hosts (bug #11306)
 * GUI: fixed a layout bug in the Mac OS X clone VM dialog (bug #10982)
 * GUI: not all the translation tags were taken into account during the language switch (bug #11342)
 * GUI: ''take guest screenshot'' dialog sometimes had no keyboard input available on Windows host
 * Main/Machine: fix generation of spurious event for inaccessible VMs which triggered an endless event generation loop in cooperation with the GUI which became unresponsive (4.2.6 regression, bug #11323)
 * Main/Display: fix for an access violation under certain conditions in multi-monitor configurations (bug #10539)
 * Main/Metrics: network metrics are now collected for active (up) interfaces only, the state of an interface being evaluated when the associated metric is enabled via setupMetrics
 * Snapshots: reduce the time for merging snapshots under certain conditions
 * Storage: fixed data corruption after resizing a VDI image under certain circumstances (bug #11344)
 * Storage: fixed non working online merging of snapshots (4.2.6 regression, bug #11359)
 * Storage: fixed crash when connecting to certain QNAP iSCSI targets
 * Storage: fixed incompatibility of VHD differencing images with Hyper-V (bug #5990)
 * Bridged Networking: fixed TCP pseudo header checksum computation for IPv6 (bug #9380)
 * 3D support: fix Battlefield 1942 game crashes (bug #11369)
 * Settings: really sanitize the name of VM folders and settings file, the code was disabled before (bug #10549)
 * Settings: allow to change VRDE settings for saved VMs
 * VBoxManage: don't crash during ''screenshotpng'' if there is no display (bug #11363)
 * Linux hosts: work around gcc bug 55940 which might lead to wrong kernel module code if gcc 4.7 is used to compile the 32-bit Linux host kernel (bug #11035)
 * Linux hosts: fixed inconsistent lock state and deadlock warnings on module load and VM startup when ''CONFIG_PROVE_LOCKING'' is enabled (bug #11318)
 * Linux hosts: made "]" key work again on Japanese keyboards
 * Mac OS X hosts: don't crash the kernel during dtrace if the VBox kernel extensions are loaded (10.6 hosts only; bug #11273)
 * Solaris / Mac OS X hosts: machine CPU load metrics now report 100% when all cores are fully utilized (used to be a single core)
 * Solaris 11 host installer: wait for any services left over from a previous installation to be terminated to avoid confusing SMF. 
 * Guest Additions: don't block signals for processes executed via guest control
 * Guest Additions: fixed a small memory leak in VBoxService (bug #10970)
 * Windows Additions: fixed shared folder issue with large reads/writes on 64 bit Windows guests (bug #11115)
 * Linux Additions: Linux 3.8 compile fixes (bug #11036)
 * X11 Additions: fixed blocked ''SIGALRM'' in 3D desktop sessions (bug #10987)
 * X11 Additions: fixed an unresolved reference in vboxvideo_drv for X.org 6.8 guests and before (e.g. RHEL4; 4.2.0 regression)
 * X11 Additions: fixed screen automatic resizing for guests with X.org 1.3 or older (4.2.0 regression)

'''!VirtualBox 4.2.6''' (released 2012-12-19)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: don't inject stale VT-x events to prevent crashes after VM reset (bug #11256)
 * VMM: workaround for buggy BIOSes which enable ''MONITOR'' only for certain CPUs (bugs #9460, #10686)
 * GUI: fixed trimming of anti-aliased text in details-view element headers (4.2.0 regression)
 * GUI: fixed create-settings-file-alias functionality on Mac hosts (4.2.0 regression)
 * GUI: fixed take-guest-screenshot functionality on Windows hosts (bug #11095)
 * GUI: several minor fixes, including palette fixes (bug #11191)
 * GUI: fixed Windows 2012 OS type (bug #11206)
 * GUI: allow to terminate the VM even if VBoxSVC crashed
 * API: fixed cancelling of snapshots, previously this could lead to inconsistent VM configs (bug #6877)
 * API: fixed identifying disk images by UUID (bug #11209)
 * 3D Support: several fixes
 * VRDP: fixed occasional crash with external authentication (bug #11156)
 * VGA: fix for double scan text modes
 * USB: fixed invalid pending request count at the time of service of ''DEVICE POWER'' requests (Windows hosts only; bugs #10021, #11056)
 * USB keyboard: Korean keyboard workaround (bug #11150)
 * Storage: fixed hang with QCOW images and asynchronous I/O enabled
 * Storage: fixed hang with newer VHD images (bug #11279)
 * Storage: actually write the non-rotational flag to the VM settings (4.2.0 regression)
 * Virtio-net: fixed the problem with network statistics counters in Session Information dialog (GUI)
 * Metrics: introduced ''network rate'' and ''disk usage'' metrics
 * Metrics: fixed a crash under certain conditions on Solaris hosts
 * BIOS: fix for El Torito
 * Shared Folders: if the host folder of a shared folder mapping does not exist, keep it active but mark it as invalid to prevent inconsitent saved states (bug #11147)
 * VBoxManage: fixed converting disks from raw images
 * VBoxManage: show snapshot description in the VM or snapshot information
 * VBoxManage: make implicit opening of media consistent in all places dealing with media
 * VBoxManage: the iSCSI initiator name was not stored in the settings file when doing ''storageattach'' (bug #11212)
 * VBoxManage: ''metrics collect'' now properly handles 'CPU/MHz' and 'Net/*/LinkSpeed' metrics
 * VBoxManage: changing the image UUID or parent UUID as part of storageattach works now in all safe cases
 * VBoxManage: introduced ''storageattach --medium additions'' as a shortcut to mount the additions image (bug #11165)
 * OVF: fixed importing OVF files cerated by recent VMware products (bug #10905)
 * Linux hosts / Bridged Networking: fixed the problem with leaking connections in conntrack (bug #11178)
 * Linux Additions: added support for ConsoleKit sessions in the vminfo service of VBoxService
 * Linux Additions: don't crash during remount under certain conditions (bug #11291)
 * Linux/Solaris Additions: fixed guest memory metrics collection
 * Solaris hosts: added a dependency to ensure that the user directories are reachable when starting VBox services
 * Windows host installer: integrated user-contributed translations, thanks to all contributors!
 * Windows Additions: fixed auto-logon installation for Windows 8
 * Windows Additions: don't fail if the shared folders host service is not available
 * Windows Additions: fixed Guest Additions startup on Windows 2000 guests (bug #11253)
 * Windows Additions: auto-resize fixes for Windows 8 guests

'''!VirtualBox 4.2.4''' (released 2012-10-26)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * GUI: fixed validation warning on global settings / proxy page (4.2.2 regression, bug #11089)
 * GUI: fixed crash with multiple guest screens on certain conditions (OS X hosts only)
 * VBoxBalloonCtrl: fixed command line argument handling of ballooning module
 * VRDP: fixed occasional crash during a video playback in the guest (bug #11082)
 * BIOS: fixed broken DMI information (4.2 regression)
 * BIOS: workaround for booting from Windows 2000 floppy disks
 * EFI: fixed video mode selection loss on VM reboot (#10983)
 * Parallel: fixed parallel port printing failure/ paper queue empty error (Windows hosts only)
 * NAT: fixed crash on alias-less DNS responses when host-resolver is used
 * Storage: fixed hang under rare circumstances

'''!VirtualBox 4.2.2''' (released 2012-10-18)[[BR]][[BR]]
This is a maintenance release. The following items were fixed and/or added:
 * VMM: adapted to changes in Mac OS X 10.8.2 (bug #10965)
 * GUI: restored VM item tool-tip functionality (4.2 regression)
 * GUI: added group item tool-tip functionality
 * GUI: fixed handling of the .ova/.ovf file name association (4.2 regression)
 * GUI: it was not possible to change any setting before the first VM was created (bug #10928)
 * GUI: disable grouping action if all the selected items are full children list of the same group already
 * GUI: added menu for runtime drag-and-drop option change
 * GUI: cleanup shared-clipboard menu on visual-mode change
 * GUI: make sure VM receives keyboard focus on entering fullscreen-mode on Win host (bug #11051)
 * GUI: disable proxy authentication for security reasons
 * 3D Support: ''DrawIndexedPrimitiveUP'' implementation fixes for the Windows WDDM video driver (bug #10929) 
 * Storage: fixed a release assertion in the AHCI emulation when requests where canceled with asynchronous I/O disabled
 * Storage: fixed a hang during VM reset under certain circumstances (bug #10898)
 * NAT: fixed a crash under rare circumstances (Windows hosts only; bug #10128)
 * NAT: automatically use the host resolver if the host name server is set to some unusual loopback value (bug #10864)
 * E1000: fixed a !VirtualBox crash during intensive network transfers (4.2 regression; bugs #10936, #10969, #10980)
 * ICH9: fixed PCI bridge initialization
 * USB mouse: ensure that the last mouse event doesn't get lost if no URBs are available
 * BIOS: certain legacy guests (e.g. Windows 95) didn't find the boot device after a warm reboot
 * BIOS: don't trash the palette in text modes when setting the border color
 * EFI: fixed OS X guest autoboot (4.2 regression)
 * VBoxManage: fixed output of ''showvminfo --machinereadable'' (bug #10973)
 * VBoxManage: fixed parsing of ''storageattach --discard'' (bug #11023)
 * VBoxManage: fixed wrong output of the HPET setting in ''showvminfo'' (bug #11065)
 * VBoxManage: fixed closing the guest session after executing a guest process via guest control
 * VBoxShell: adaptions to interface name changes
 * Guest Additions device: fixed a Guest Additions hang when a machine was reset after a crash
 * Linux hosts / guests: Linux 3.7-rc1 fixes
 * Linux Additions: support X.Org Server 1.13
 * Linux Additions: fixed a hang when the X server was restarted with old guest kernels
 * Linux Additions: fixed a VBoxService crash during CPU hot remove (bug #10964)
 * Windows Additions: fixed automatic screen resize issue for NT4 guests
 * OS/2 Additions: fixed shutdown hang
 * OS/2 Additions: fixed mouse driver panic
 * Solaris hosts: fixed autostart service going into maintenance mode after all VMs started
 * Solaris hosts: fixed linking the host driver with the dtrace module

'''!VirtualBox 4.2.0''' (released 2012-09-13)[[BR]][[BR]]
This version is a major update. The following major new features were added:
 * Improved Windows 8 support, in particular many 3D-related fixes
 * GUI: VM groups (bug #288)
 * GUI: expert mode for wizards
 * GUI: allow to alter some settings during runtime
 * Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805)
 * Resource control: added support for limiting network IO bandwidth; see the manual for more information (bug #3653)
 * Added possibility to start VMs during system boot on Linux, OS X and Solaris; see the manual for more information (bug #950)
 * Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)
 * Added support for parallel port passthrough on Windows hosts
 * Enhanced API for controlling the guest; please see the SDK reference and API documentation for more information
In addition, the following items were fixed and/or added:
 * Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
 * VMM: fixed a potential host crash triggered by shutting down a VM when another VM was running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897)
 * VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests)
 * VMM: improved VM context switch performance for Intel CPUs using nested paging
 * VMM: added support for ''FlushByASID'' features of AMD CPUs (Bulldozer and newer)
 * VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
 * VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
 * VMM: support recent VIA CPUs (bug #10005)
 * VMM: fixed handling of task gates if VT-x/AMD-V is disabled
 * VMM: page fusion fixes
 * GUI: network operations manager
 * GUI: allow taking screenshots of the current VM window content (bug #5561)
 * GUI: allow automatically sorting of the VM list
 * GUI: allow starting of headless VMs from the GUI
 * GUI: allow reset, shutdown and power off from the Manager window
 * GUI: allow to globally limit the maximum screen resolution for guests
 * GUI: show the full medium part on hovering the list of recently used ISO images
 * GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
 * GUI: don't crash on terminate if the settings dialog is still open (bug #9973)
 * GUI: consider scaled DPI values when display fonts on Windows hosts (bug #9864)
 * GUI: if a bridged network interface cannot be found, don't refuse to start the VM but allow the user to change the setting immediately
 * Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9364, #9604, #10491)
 * Clipboard: disable the clipboard by default for new VMs (see the manual for more information). It can be enabled at any time using the VM menu.
 * Settings: sanitize the name of VM folders and settings file (bug #10549)
 * Settings: allow to store the iSCSI initiator secret encrypted
 * NAT: improvements for the built-in TFTP server (bugs #7385, #10286)
 * NAT: fixed memory leak when disabling the NAT engine (bug #10801)
 * E1000: 802.1q VLAN support (bug #10429)
 * Storage: implemented burning of audio CDs in passthrough mode
 * Storage: fixed audio CD passthrough for certain media players
 * Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
 * Storage: added support for QED images
 * Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
 * Storage: added readonly support for VHDX images
 * USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only)
 * Solaris additions: added support for X.org Server 1.11 and 1.12
 * Solaris additions: switched to using an in-kernel mouse driver
 * Windows hosts: no need to recreate host-only adapters after a !VirtualBox update
 * Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options
 * Windows Additions: fixed memory leak in VBoxTray (bug #10808)