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,在Sun被Oracle收购后现改名为Oracle
VirtualBox.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 4.0.4
VirtualBox 4.0.4 (released 2011-02-17)
This is a maintenance release. The following items were fixed and/or added:
- VMM: fixed recompiler crashes under certain conditions (bugs #8255, #8319 and further)
- VMM: fixed running 64-bit guests on 32-bit host with nested paging enabled on AMD CPUs (4.0 regression; bug #7938)
- VMM: fixed timing issues / hangs for certain guests using the programmable interval timer (bugs #8033 and #8062)
- VMM: large page and monitoring fixes for live snapshots (bugs #7910, #8059, #8125)
- GUI: fixed error message when trying to exceed the maximum number of host network interfaces
- GUI: fixed saving of changes to the metadata of an existing snapshot (bug #8145)
- GUI: fixed rare crash on X11 hosts (bug #8131)
- GUI: when selecting a shared folder, start the file dialog in the users home directory (bug #8017)
- ExtPack: enforce the correct permissions which might be
restricted by umask when creating directories (non-Windows hosts only;
bug #7878)
- VBoxSDL: fixed crash when starting by specifying the VM UUID (4.0 regression; bug #8342)
- VBoxManage: allow savestate even if the VM is already paused
- VBoxManage: fixed modifyvm --synthcpu (bug #6577)
- VBoxManage: fixed hang when doing guestcontrol execute –wait-for exit and displaying process status on exit (bug #8235)
- VBoxManage: decreased CPU load during guestcontrol execute –wait-for exit/stdout while waiting for the guest process to terminate (bug #7872)
- VBoxManage: fixed list hostdvds/hostfloppies
- VBoxManage: fixed storageattach for host DVD drives and host floppy drives
- Metrics: introduced RAM/VMM base metric.
- Main: improved sanity check when taking a VM screen shot (bug #7966)
- Main: fixed a crash under rare circumstances if a VM failed to start
- Main: fixed attaching of immutable disk images (bug #8105)
- Main: fixed a crash at VM shutdown (bug #6443)
- Main: fixed incorrect handling of cross-referenced medium attachments (bug #8129)
- Settings: fixed truncating of big integer values (4.0 regression)
- Settings: properly store the ICH9 chipset type (bug #8123)
- Host-Only & Bridged Networking: fixed VBox DHCP server startup issue for Windows hosts (4.0 regression; bug #7905)
- Host-Only Networking: re-create vboxnetX interfaces after vboxnetadp.ko module reload on Linux and Darwin (bugs #5934, #6341)
- NAT: fixed an mbuf leak under rare circumstances (bug #7459)
- ACPI: don’t allow the guest to enter S4 by default and don’t announce S1 and S4 in the ACPI tables if disabled (bug #8008)
- Graphics card: made re-enabling disabled screens work correctly
to prevent problems when X11 guests enter screen saving mode (bug #8122)
- Storage: fixed write errors with snapshots if the host cache is disabled (4.0 regression; bug #8221)
- ATA/SATA: fixed reset handling after ACPI suspend/resume
- BusLogic: fixed hang with SMP VMs
- Serial: another attempt to prevent lost characters during transmission (bug #1548)
- Linux hosts/guests: Linux 2.6.38-rc1 compile fixes
- Mac OS X hosts: fixed VBoxSVC crash when listing host interfaces without default gateway (64-bit hosts only; bug #7955)
- Solaris/Darwin hosts: fixed VM CPU execution cap
- X.Org guests: fixed a crash on X server restart (bug #8231)
- X.Org guests: support X.Org Server 1.10 pre-release and Ubuntu 11.04 Alpha.
- X.Org guests: Add EDID emulation in the graphics driver to prevent GNOME settings daemon changing the mode on login.
- X.Org guests: never send graphics modes to the host that older VirtualBox versions can’t handle.
- Linux Additions: fixed a memory leak in the shared folders code if a host link is not readable (bug #8185)
- Windows Additions: fixed handling of Security Attention Sequence (SAS) with VBoxGINA
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