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。

VirtualBox 3.1.6(released 2010-03-25)

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

• Linux hosts: fixed timing issue on hosts with Linux kernels 2.6.31 or later with certain CPUs (asynchronous timer mode; bug #6250)
• Linux hosts: properly handle host suspend/resume events on Linux kernels 2.6.30 or later (bug #5562)
• Mac OS X hosts: fixed VBoxSVC crash while enumerating the host network interfaces under certain circumstances
• Snapshots: fixed image corruption after snapshot merge under certain circumstances (bug #6023)
• Snapshots: fixed crash with VBoxHeadless / OSE
• VMM: fixed reference counting guru meditation (bug #4940)
• VMM: improved guest SMP stability
• VMM: fixed VT-x hardware debug issues (bugs #477 & #5792)
• VMM: fixedPGMDynMapHCPageguru meditation (Mac OS X; VT-x only; bug #6095)
• VMM: fixedpgmPoolTrackFlushGCPhysPTIntguru meditations (Mac OS X; VT-x only; bugs #6095 & #6125)
• VMM: Fixed host crash when running PAE guests in VT-X mode (Mac OS X only; bug #5771).
• GUI: fix displaying of error message (bug #4345)
• GUI: fix inability to enter seamless mode (bugs #6185, #6188)
• 3D support: fixed assertion and flickering when guest application uses several windows with a single OpenGL context (bug #4598)
• 3D support: fixed host crashes when usingGL_EXT_compiled_vertex_arrayand array element calls (bug #6165)
• 3D support: fixed runtime linker errors with OpenGL guest libs (bug #5297)
• 3D support: fixed OpenGL extension viewer crash on startup (bug #4962)
• NAT: fixed a 3.1.4 regression on Windows hosts where graceful connection termination was broken (bug #6237)
• NAT: alternative network setting was not stored persistent (bug #6176)
• NAT: fixed memory corruption during ICMP traffic under certain circumstances
• Network: allow to switch the host interface or the internal network while a VM is running (bug #5781)
• VHD: fix for images with a block size different than 2MB
• USB: fixed filtered device attach regression (bug #6251)
• USB: fixed crash in OHCI under rare circumstances (bug #3571)
• VRDP: fixed hang under rare circumstances when attaching USB devices
• ACPI: prevent guest freezes when accessing /proc/acpi for determining the state of the host battery and the AC adapter (Linux hosts only; bug #2836)
• PulseAudio: fixed guest freezes under certain conditions (3.1.4 regression; bug #6224)
• BIOS: increased space for DMI strings
• BIOS: fixed interrupt routing problem for certain configurations (I/O-APIC enabled, ACPI not used; bug #6098)
• iSCSI: be more robust when handling theINQUIRYresponse
• iSCSI: be more robust when handling sense data
• BusLogic: fixed FreeBSD guests
• webservice: vboxwebsrv is now multithreaded
• Solaris Installer: fixed netmask to stay persistent across reboots for Host-only interface (bug #4590)
• Linux installer: removed external dependency to libpng12.so (bug #6243)
• Solaris Additions: fixed superfluous kernel logging (bug #6181)
• Linux Additions: fixed hang when starting the X server in Fedora12 guests and in guests with Linux 2.6.33 or later (bug #6198)
• Linux Additions: support Mandriva speedboot runlevel (bug #5484)
• Linux Additions: fixed SELinux security context of mount.vboxsf (bug #6362)
• Linux Additions: support Ubuntu 10.04 (bug #5737)
• Web service: update PHP bindings to fix problems with enums and collections