VirtualBox是一款功能强大的x86虚拟机软件，它不仅具有丰富的特色，而且性能也很优异。更可喜的是，VirtualBox于数日前走向开源，成为了一个发布在GPL许可之下的自由软件。　　VirtualBox 可以在 Linux 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。

VirtualBox 3.0.12 (released 2009-11-17)

This is a maintenance release. The following items were fixed and/or added:
VMM: reduced IO-APIC overhead for 32 bits Windows NT/2000/XP/2003 guests; requires 64 bits support (VT-x only; bug #4392)
VMM: fixed double timer interrupt delivery on old Linux kernels using IO-APIC (caused guest time to run at double speed; bug #3135)
VMM: reinitialize VT-x and AMD-V after host suspend or hibernate; some BIOSes forget this (Windows hosts only; bug #5421)
VMM: fix loading of saved state when RAM preallocation is enabled
BIOS: ignore unknown shutdown codes instead of causing a guru meditation (bug #5389)
GUI: never start a VM on a single click into the selector window (bug #2676)
Serial: reduce the probability of lost bytes if the host end is connected to a raw file
VMDK: fix handling of split image variants and fix a 3.0.10 regression (bug #5355)
VRDP: fixed occasional VRDP server crash
Network: even if the virtual network cable was disconnected, some guests were able to send / receive packets (E1000; bug #5366)
Network: even if the virtual network cable was disconnected, the PCNet card received some spurious packets which might confuse the guest (bug #4496)
Shared folders: fixed changing case of file names (bug #2520)
Windows Additions: fix crash in seamless mode (contributed by Huihong Luo)
Linux Additions: fix writing to files opened in O_APPEND mode (bug #3805)
Solaris Additions: fix regression in guest additions driver which among other things caused lost guest property updates and periodic error messages being written to the system log