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。
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VirtualBox 2.2.4 (released 2009-05-29)
This is a maintenance release. The following items were fixed and/or added:
- Windows Installer: fixed a potential hang during installation
- Windows Installer: fixed several problems (bug )
- Solaris hosts: make it work with Solaris build 114 or later (bug )
- Solaris hosts: fixed a bug serial port character handling found during loopback (bug )
- Linux hosts: adapted vboxdrv.sh to the latest changes in VBoxManage list runningvms (bug )
- Windows hosts: fixed a crash caused by host-only/bridged networking
- Mac OS X hosts: fixed access to host DVD with passthrough disabled (bug )
- Guest Additions: fixed problems with KDE 4 not recognizing mouse clicks
- Windows Additions: fixed incorrect 8-bit guest color depth in Windows 7 guests
- GUI: warn if VT-x/AMD-V could not be enabled for guests that require this setting (bug )
- VMM: fixed occassional crash due to insuffient memory
- VMM: fixed hanging 64 bits Solaris guests
- VMM: restore from a saved state occassionally failed (bugs and )
- Clipboard: fixed a deadlock while shutting down the shared clipboard on X11 hosts (bug )
- OVF: fixed potential hang during import
- OVF: fixed potential crashes during import/export on Win64 hosts
- VBoxManage modifyhd --compact: fixed bug which could lead to crashes and image corruption (bug )
- VBoxManage metrics collect: now flushes the output stream.
- VHD: made VBoxManage internalcommands sethduuid work for .vhd files (bug )
- VHD: some .vhd files could not be cloned (bug #4080)
- VMDK: fixed creating snapshots
- NAT: improvement of TCP connection establisment (bug )
- NAT: fixed order of DNS servers in DHCP lease (bug )
- NAT: fixed DHCP lease for multiple name servers (bug )
- NAT: fixed a potential segfault if the host lost its connectivity (bug )
- Shared Folders: deny access to parent directories on Windows hosts (bug )
- Shared Folders: make rm/rmdir work with Solaris guests on Windows hosts
- Networking: fixed the problem with blocked receiving thread when a broadcast packet arrives too early to be handled by uninitialized e1000 adapter.
- Networking: fixed the problem that caused host freezes/crashes when using bridged mode with host’s interface having RX checksum offloading on (bug and related). Fixes problems with TX offloading as well (bug )
- PXE boot: Added support for PRO/1000 MT Server adapter.
- Python bindings: fixed keyword conflict
- SCSI: fixed occasional crashes on Win64
- Serial: allow to redirect the serial port to a raw file (bug )
- VRDP: fixed a rare incorrect screen update
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