= !VirtualBox vs. VMware vs. Parallels = || '''Feature''' || '''!VirtualBox''' || '''Parallels Workstation / Desktop''' || '''VMware Server / Workstation''' || || Supported host operating systems || Windows 2000, XP, 2003, Vista, 2008 Server, Windows 7, 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, Windows 7, Windows Server 2003/2008, 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 || yes || yes || 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 8 || up to 5 || up to 4 || || Virtual Disk Controller || IDE or SATA (up to 32 disks in a guest) or SCSI || IDE (up to 4) || IDE or 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 3 || yes || || CD/DVD writing || yes || no || no || || 3D acceleration || yes (OpenGL 1.5)|| 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 || || Seamless Windows || yes || yes || yes || || Shared Folders || yes || yes || yes || || Guest power status reporting || yes || no || yes || || 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 || Workstation for Windows/Linux - $49.99, Desktop for Mac OS X - $79.99 || Workstation for Windows/Linux around $189, Fusion for Mac - $79.99, Server free for end users, not redistributable ||