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VirtualBox is a powerful x86 virtualization product 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). See "About VirtualBox" for an introduction.

Presently, VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7), DOS/Windows 3.x, Linux (2.4 and 2.6), Solaris and OpenSolaris, 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. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Sun ensures the product always meets professional quality criteria.

Some of the features of VirtualBox are:
• 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.

VirtualBox 4.1.0 (released 2011-07-19)
This version is a major update. The following major new features were added:
    Support for cloning of VMs (bug #5853, see the manual for more information): full clones can be created through the GUI and VBoxManage, linked clones only through VBoxManage
    GUI: enhanced wizard for creating new virtual disks
    GUI: new wizard for copying virtual disks
    GUI: keep the aspect ratio in scale mode (Windows and OSX hosts only; bug #7822)
    VMM: raised the memory limit for 64-bit hosts to 1TB
    Experimental support for PCI passthrough for Linux hosts, see the manual for more information
    Windows guests: Experimental WDDM graphics driver, supporting Windows Aero (bug #4607) and providing Direct3D support using a cleaner approach (no need to install the guest drivers in Safe Mode anymore)
    Guest Additions: status of modules and features can now be queried separately by the frontends
    Networking: new network attachment mode "Generic Driver", which offers an open plugin architecture for arbitrary and separately distributable virtual network implementations
    Host-only Networking: fixed host crash in kernels prior to 2.6.29
    New Networking Mode UDP Tunnel: allows to interconnect VMs running on different hosts easily and transparently, see the manual for more information
    Experimental support for SATA hard disk hotplugging available with VBoxManage
    Solaris hosts: New Crossbow based bridged networking driver for Solaris 11 build 159 and above

In addition, the following items were fixed and/or added:
    VMM: more SMP timer fixes
    VMM: fixed sporadic recompiler crashes with SMP guests
    VMM: many small fixes
    GUI: when reverting to a snapshot, ask for taking a snapshot of the current state
    GUI: added a View menu
    GUI: added a setting for the promiscuous mode policy for internal networks, bridged networks and host-only networks
    GUI: added slider for setting the CPU execution cap allowing to limit the amount of CPU time spent for the execution of the guest, see the manual for more information.
    GUI: the VM description is editable during the runtime of a VM (bug #1551)
    GUI: added proxy settings (bug #2870)
    GUI: made the number of SATA ports configurable
    GUI: decrease time before showing the VM configuration dialog
    VBoxManage: more convenient configuration of storage controller attachments by automatically determining the port or device parameter when a storage controller has only one port or device per port
    VBoxManage: changed syntax of the guestcontrol command group, fixed various bugs, removed obsolete options
    VBoxBalloonCtrl: new service for automatic dynamic adjustment of the balloon size for running VMs
    Settings: machine names and snapshot names are not allowed to be a valid UUID
    Settings: provide better diagnostics if a single medium is used twice in a VM configuration
    Settings: provide better diagnostics for errors in medium create/merge/clone operations, and fix memory leaks in error cases
    Storage: ATA/SATA drives can be marked as non-rotational, i.e. the guest OS will detect them as a SSD if supported, which can improve performance
    Storage: virtual CD/DVD images will be detached if the guest ejects the medium, unless the drive is marked to handle ejects only on a temporary basis
    Storage: the medium UUID can be changed again when attaching a medium for the first time, which allows using images which are exact duplicates including the UUID
    Storage: fixed possible data corruption under certain circumstances with VHD and Parallels images (bug #9150)
    Storage: fixed unnecessary expansion when cloning differential images in VDI format
    Storage: fixed detection code to handle empty files for VDI and VMDK format
    Storage: fixed access to CD/DVD images beyond 4GB when using the SATA controller (bug #8592)
    Floppy: several bugs have been fixed
    Floppy: make it possible to unmount a host floppy disk (bug #6651)
    BIOS: disk-related structures are now checksummed correctly (bug #8739)
    USB: many fixes for the Windows USB host driver
    NAT: reduced memory footprint
    Networking: fixed the problem with segmentation offloading when several VMs are transmitting in parallel
    Networking: workaround for a bug in wireshark when operating directly on a capture file created by VirtualBox
    Serial: announce the serial devices in the ACPI tables to make Windows guests find the virtual hardware (bug #7411)
    VRDP: support for TLS connections (see the manual for more information)
    VRDP: support for multimonitor client configurations with MS RDP clients
    VRDP: fixed a rare screen corruption
    3D support: fixed GL_VERSION string for different locales (bug #8916)
    Webservice: fixed timeout handling with HTTP 1.1 keepalive, and be more robust when connections fail
    VBoxSVC: fixed regression when several clients trigger autostart simultaneously
    Main: fixed incorrect handling of the medium location for media which are not file based (e.g. iSCSI), which resulted in confusing location values in many places
    JAX-WS client bindings: fixed resource leak
    Sources: fixed USB 2.0 support using extension packs for non-official builds
    Mac OS X hosts: fixed non-VT-x mode on Lion hosts
    Windows hosts: fixed copy'n'paste in the GUI and for the VM window (bug #4491)
    Windows hosts (64-bit only): enabled removing of all mediums when removing a VM
    Windows hosts (64-bit only): enabled live snapshot deletion
    Windows hosts: use native controls in the installer (bug #5520)
    Solaris hosts: fixed preemption issue with Solaris 11 hosts (builds 166 and above)
    Solaris hosts: better control of USB device access on Solaris 11 hosts
    Guest Additions: improved driver installation on Windows guests
    Guest Additions: fixed high CPU usage while executing guest programs from the host
    Solaris Additions: fixed automounting of shared folders (bug #8014)

32Bit (Size: 64MB)

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