VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use.

Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).

Presently, VirtualBox runs on Macintosh, Windows, and Linux hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista), DOS/Windows 3.x, Linux (2.4 and 2.6), and OpenBSD.

VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on.

Here are some key features of "VirtualBox":

Modularity:
· VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface for VirtualBox.

Virtual machine descriptions in XML:
· The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.

Guest Additions for Windows and Linux:
· VirtualBox has special software that can be installed inside Windows and Linux virtual machines to improve performance and make integration much more seamless. Among the features provided by these Guest Additions are mouse pointer integration and arbitrary screen solutions (e.g. by resizing the guest window).

Shared folders:
· Like many other virtualization solutions, for easy data exchange between hosts and guests, VirtualBox allows for declaring certain host directories as "shared folders", which can then be accessed from within virtual machines.

What's New in This Release: [ read full changelog ]

· VMM: fixed 64 bits guest on 32 bits host regression in 3.0.6 (VT-x only; bug
· #4947)
· VMM: fixed a recompiler triple fault guru meditation (VT-x & AMD-V only; bug
· #5058)
· VMM: fixed hang after guest state restore (AMD-V, 32 bits Windows guest and
· IO-APIC enabled only; bug #5059)
· VMM: fixed paging issue with OS/2 guests
· VMM: fixed guru meditation in rare cases (2.0 regression; software virtualization
· only)
· VMM: fixed rare paging problem with AMD-V
· VMM: fixed release assertion during state restore when using the Sound Blaster
· 16 emulation (bug #5042)
· Security: fixed vulnerability that allowed to execute commands with root privi-
· leges
· X11-based hosts: support additional function keys on Sun keyboards (bug
· #4907)
· Mac OS X hosts (Snow Leopard): fixed problem starting headless VMs without a
· graphical session (bug #5002)
· Mac OS X hosts: fixed problem listing host-only adapter names with trailing
· garbage (attached VMs won’t start)
· VRDP: start VM even if configured VRDP port is in use
· Networking: the PCnet network device stopped receiving under rare conditions
· (bug #4870)
· VBoxManage: implemented controlvm vrdpport command
· iSCSI: fixed issue with NetApp targets (#5072)
· SCSI: add support for virtual disks larger than 2TB
· USB: fixed potential crash when unplugging USB2 devices (bug #5089)
· NAT: IPSEC did not properly work with Linux guests (bug #4801)