感谢趣味解读的投递
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：http://download.virtualbox.org/virtualbox/3.1.2/VirtualBox-3.1.2-56127-Win.exe

VirtualBox 3.1.2 (released 2009-12-17)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed SMP stability regression
• USB: fixed USB related host crashes on 64 bits Windows hosts (#5237)
• Main: wrong default HWVirtExExclusive value for new VMs (bug #5664)
• Main: DVD passthrough setting was lost (bug #5681)
• VBoxManage: iSCSI disks do not support adding a comment (bug #4460)
• VBoxManage: added missing --cpus and --memory options to OVF --import
• GUI: fixed VBox URL in update dialog for German and Dutch languages
• GUI: NLS updates
• OVF: fixed export of non standard storage controller names (bug #5643)
• Solaris hosts: several USB fixes (including support for Apple iPhone)
• Mac OS X hosts: several fixes for the 3D support
• Mac OS X hosts: re-enabled CMD+Key combinations, even if the Host-Key isn't CMD (bug #5684)
• Mac OS X hosts: fixed to fast scrolling if the mouse wheel is used inside the guest (bug #5672)
• Mac OS X hosts: dock & menubar don't disappear in fullscreen when the VM is not running on the primary display (bug #1762)
• Mac OS X hosts: added an option for enabling "Auto show Dock & Menubar in fullscreen" (bug #5636)
• Windows host installer: fixed starting VBox with wrong privileges right after installation (bug #4162)
• Host interface and host-only networking: prevent driver from unloading while a VM is still active (Windows host only)
• Host-only networking: fixed host-only interface creation (Windows host only) (bug #5708)
• Virtio-net: don't crash without an attached network
• Virtio-net: fixed the issue with intermittent network in VM with several virtual CPU cores.
• NAT: fixed port-forwarding regressions (bug #5666)
• NAT: fixed crash under certain conditions (bug #5427)
• NAT: fixed resolving of names containing a slash or underscore when using the host resolver DNS proxy (bug #5698)
• ATA: fixed sporadic crash when resuming after a VM was forcefully paused (e.g. due to iSCSI target being unavailable)
• SATA: fixed raw vmdk disks (bug #5724)
• Linux guests: increased the default memory for Redhat and Fedora guests
• Linux Guest Additions: fixed installation on RHEL 3.9 guests and on some 64bit guests
• Linux Guest Additions: prevent SELinux warnings concerning text relocations in VBoxOGL.so (bug #5690)
• X11 guests: fixed mouse support for some Xorg 1.4 guests (openSUSE 11.0)
• X11 guests: fixed xorg.conf modification for some older Xorg releases (openSUSE 11.1)
• Windows guests: fixed some VBoxService shutdown issues
• Windows guests: fixed VBoxVideo spinlock issues on NT4
• Windows Guest Additions: fixed uninstallation issues of NT4
• Shared folders: fixed resolving of symlink target (bug #5631)
• 2D Video acceleration: delay loading of OpenGL dlls for Windows hosts to avoid GUI crashes on misconfigured systems
• 2D Video acceleration: fixed issues with video picture not displayed on playback
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