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VirtualBox vs. VMware vs. Parallels
| Feature | VirtualBox | Parallels Workstation / Desktop | VMware Server / Workstation |
| Supported host operating systems | Windows 2000, XP, 2003, Vista, Linux, OS X (beta), Solaris (under development), FreeBSD (under development) | Windows 2000, XP, 2003, Vista, Linux, OS X | Windows 2000, XP, 2003, Vista, Linux (32bit and 64bit), OS X (beta) |
| Supported guest operating systems | DOS, Windows 3.1, 95, 98, NT, 2000, XP, Vista, Linux, OpenBSD, FreeBSD, OS/2, Solaris, 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 |
| 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 |
| Parallels 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 |
| Support of Virtual PC images | no (planned) | no | no |
| 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 |
| API | Full API, 100% scriptable | no | yes |
| Open source | Yes (dual licensed, some enterprise features are closed source) | no | no |
| License costs | Free in most cases, otherwise €100 / $130 | $49.99 for Windows/Linux, $79.99 for Mac OS X | Workstation around $199, Server free for end users, not redistributable |
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