VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
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, Linux and Solaris. VirtualBox has special software that can be installed inside Windows, Linux and Solaris 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). There are also guest additions for OS/2 with somewhat reduced functionality.
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.
- GUI: fixed disappearing settings widgets on KDE hosts (bug #6809)
- Storage: fixed hang under rare circumstances with flat VMDK images
- Storage: a saved VM could not be restored under certain circumstances after the host kernel was updated (bug #8983)
- Storage: refuse to create a medium with an invalid variant (for example Split2G with VDI; bug #7227)
- Snapshots: none of the hard disk attachments must be attached to another VM in normal mode when creating a snapshot
- USB: fixed occasional VM hangs with SMP guests (bug #4580)
- USB: proper device detection on RHEL/OEL/CentOS 5 guests (partial fix for bug #8978)
- ACPI: force the ACPI timer to return monotonic values for improve behavior with SMP Linux guests (bug #8511 and others)
- RDP: fixed screen corruption under rare circumstances (bug #8977)
- rdesktop-vrdp: updated to version 1.7.0
- OVF: under rare circumstances some data at the end of a VMDK file was not written during export
- Mac OS X hosts: Lion fixes (bug #8903)
- Mac OS X hosts: GNOME 3 fix
- Linux hosts: fixed VT-x detection on Linux 3.0 hosts (bug #9071)
- Linux hosts: fixed Python 2.7 bindings in the universal Linux binaries
- Windows hosts: fixed leak of thread and process handles
- Windows Additions: fixed bug when determining the extended version of the Guest Additions (4.0.8 regression; bug #8948)
- Solaris Additions: fixed installation to 64-bit Solaris 10u9 guests (4.0.8 regression)
- Linux Additions: RHEL6.1/OL6.1 compile fix
- Linux Additions: fixed a memory leak during VBoxManage guestcontrol execute (bug #9068)