= !VirtualBox vs. VMware vs. Parallels = || '''Feature''' || '''!VirtualBox''' || '''Parallels Workstation / Desktop''' || '''VMware Server / Workstation''' || || Supported host operating systems || Windows 2000, XP, 2003, Vista, Linux, Mac OS X, Solaris 10U5, !OpenSolaris, FreeBSD (under development) || Windows 2000, XP, 2003, Vista, Linux, OS X || Windows 2000, XP, 2003, Vista, Linux (32bit and 64bit), Mac OS X || || Supported guest operating systems || DOS, Windows 3.1, 95, 98, NT, 2000, XP, Vista, Linux, OpenBSD, FreeBSD, OS/2, Solaris, !OpenSolaris, others || DOS, Windows 3.1, 95, 98, NT, 2000, XP, Vista, Linux, OS/2 || DOS, Windows 3.1, 95, 98, NT, 2000, XP, Vista, Linux, FreeBSD, Solaris || || 64bit host OS support || yes || no || yes || || 64bit guest OS support || no (planned) || no || yes || || Intel VT-x support (CPU virtualization extensions) || yes || yes || limited || || AMD-V support (CPU virtualization extensions) || yes || yes || limited || || Virtual network cards || up to 4 || 1 || up to 4 || || Virtual Disk Controller || IDE or SATA || IDE || SCSI || || USB support || yes || yes || yes || || iSCSI support (VMs can directly access storage servers over iSCSI) || yes || no || no || || Serial ports || up to 4 || up to 4 || yes || || Parallel ports || no || up to 4 || yes || || CD/DVD writing || yes || no || no || || 3D acceleration || no || no || limited || || Support of VMware images || yes || no || n/a || || Headless operation || yes || no || yes || || Remote VM access || Integrated RDP server || no || limited || || Remote USB support || Yes, arbitrary devices || no || no || || Window overlaying || no (planned) || yes ("coherence") || no || || Guest power status reporting || yes || no || in beta || || API || Full API, 100% scriptable || no || yes || || Open source || yes (dual licensed, some enterprise features are closed source) || no || no || || Customizations || yes, upon request || no || no || || License costs || Free || $49.99 for Windows/Linux, $79.99 for Mac OS X || Workstation around $199, Server free for end users, not redistributable ||