VirtualBox最早是德国一家软件公司InnoTek所开发的虚拟系统软件，后来被Sun收购，改名为 Sun VirtualBox，性能有很大的提高。
因为他是开源的，不同于VM，而且功能强大，可以在 Linux/Mac 和 Windows 主机中运行，并支持在其中安装 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客户操作系统。假如你曾经有用过虚拟机软件的经历的话，相信使用 VirtualBox 不在话下。即便你是一个新手，也没有关系。VirtualBox 提供了详细的文档，可以助你在短期内入门。
下载 VirtualBox 3.1.4 Final
http://download.virtualbox.org/virtualbox/3.1.4/
VirtualBox 3.1.4 (released 2010-02-12)
This is a maintenance release. The following items were fixed and/or added:
* VMM: SMP stability fixes
* VMM: fixed guru meditation in certain rare cases (bug #5968)
* VMM: activate NXE for PAE enabled guests (VT-x and AMD-V on 32 bits hosts only; bug #3578)
* VMM: added workaround for broken BIOSes that make VirtualBox think AMD-V is in use (for details see bug #5639)
* VMM: fixed rare host reboot when restoring a saved state (bug #3945)
* VMM: fixed incompatibility with 2.6.32 Linux kernels (software virtualization only; bug #6100)
* VMM: turn on nested paging by default for new VMs (if available; VT-x and AMD-V only)
* VMM: turn on VPID by default for new VMs (if available; VT-x only)
* VMM: perform strict CPUID compatibility checks when teleporting; to get the old behavior set “VBoxInternal/CPUM/StrictCpuIdChecks” to 0
* VMM: fixed VM crash with certain 16 bits Windows applications (software virtualization only; bug #5399)
* Snapshots: fixed a 3.1 regression that broke deletion of snapshots when a machine had immutable or writethrough storage attached (bug #5727)
* Saved state: fixed VERR_SSM_LOADED_TOO_MUCH error when loading DisplayScreenshot(bug #6162)
* VBoxManage: add restorecurrent operation to snapshots command
* VBoxManage: fixed broken snapshot lookup by name (bug #6070
* GUI: fixed the broken “Reload” button that reloads the machine XML when a machine is inaccessible
* GUI: fixed guest fullscreen mode after reboot (bug #5372)
* GUI: handle Ctrl+Break properly on X11 hosts (bug #6122)
* GUI: fixed status LEDs for storage devices
* GUI: workaround for disabling the seamless mode on KDE hosts (KWin bug)
* 3D support: fixed SELinux warning saying VBoxOGL.so requires text relocation (bug #5690)
* 3D support: fixed Corrupted surface rendering (bug #5695)
* 3D support: free textures on guest application termination (bug #5206)
* 3D support: fixed ubigraph_server crashes (#4674)
* 3D support: fixes for 64-bit Solaris guests
* Seamless: disable seamless mode when guest changes screen resolution (bug #5655)
* NAT: fixed high CPU load under certain circumstances (Windows hosts only; bug #5787)
* NAT: fixed handling of the broadcast flag in DHCP requests
* NAT: fixed rare crash due to an assertion in the ICMP code (bug #3217)
* Virtio-net: don’t crash when ports accessed beyond the valid range (bug #5923)
* LsiLogic: fix for Windows 7 guests
* ATA: fix for guru meditation when installing Solaris 8 guests (bug #5972)
* VHD: fixed an incompatibility with Virtual PC (bug #5990)
* VHD: update the footer backup after setting a new UUID (bug #5004)
* Host DVD: really fixed loading “passthrough” setting from config file (bug #5681)
* Shared folders: fixed resolving of symlink target on Linux (3.1.2 regression)
* VRDP: fixed VERR_NET_ADDRESS_IN_USE error when restarting a VM (3.1 regression; bug #5902)
* VRDP: fixed crash on Mac OS X when 3D is enabled (3.1 regression)
* PulseAudio: fixed recording (bug #4302)
* USB: fixed a shutdown blue screen (Windows hosts only; bug #5885)
* BIOS: fixed attribute during text scroll (bug #3407)
* OVF: fix strange error messages on disk import errors
* OVF: do not require write access the the .ovf file during import (3.1 regression; bug #5762)
* iSCSI: fix taking snapshots of a running VM (#5849)
* Solaris hosts: several USB fixes (including support for Apple iPod; bug #5873)
* Solaris installer: fixed USB module removal and Solaris 10 “id” binary incompatibility
* Guest Additions: fixed wrong guest time adjustment if the guest clock is ahead (3.1 regression; non-Windows guests only)
* Linux Additions: fixed shared folders for Linux 2.6.32 guests (bug #5891)
* Linux Additions: make the mouse driver work on Debian 5.0.3 guests again (3.1.2 regression, bug #5832)
* Windows Additions: fixed malfunctioning !VBoxService that broke time-sync (bug #5872)
* Windows Additions: fixed uninstallation issues on 64-bit guests
* Windows Additions: fixed some sysprep execution issues
* X.Org Additions: never reject the saved video mode as invalid (bug #5731)
* XFree86 Additions: accept video mode hints for the initial mode again
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