VirtualBox虚拟机2

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。
This is a maintenance release. The following items were fixed and/or added:
Mac OS X hosts: fixed incompatibility with recent Mac OS X versions in 64-bit mode (bug 8474) 
Mac OS X hosts: fixed incompatibility with hosts with more than 16 cores (bug 8389) 
Mac OS X hosts: fixed painting corruptions on a second monitor in 64-bit mode (bug 7606) 
GUI: restored functionality to set an empty host key to disallow any host key combination (4.0.6 regression; bug 8793) 
VBoxManage: added controlvm screenshotpng subcommand for saving the screenshot of a running VM in PNG format 
VBoxHeadless: fixed potential crash during shutdown (Windows hosts only) 
NAT: built-in services use the correct Ethernet addresses in Ethernet header and in ARP requests 
Host-only networking: fixed adapter reference counting 
E1000: fixed rare guest crashes with Linux SMP guests (bug 8755) 
SATA: fixed guest disk corruption under rare circumstances (only relevant for guests with more than 2GB RAM; bug 8826) 
Storage: fixed data corruption after a snapshot was taken with asynchronous I/O enabled (bug 8498) 
Floppy: several improvement 
HPET: another fix for time jumps (bug 8707) 
USB: removed assumption that string descriptors are null-terminated (Windows hosts only) 
3D support: fixed a potential crash when resizing the guest window 
3D support: fixed GNOME 3 rendering under Ubuntu 11.04 and Fedora 15 
Snapshots: fixed another bug which could lose entries in the media registry when restoring a snapshot (bug 8363) 
Shared Folders: don't stop mounting the other valid folders if one host folder is inaccessible (4.0.6 regression) 
Linux Additions: check whether gcc and make are installed before building kernel modules (bug 8795) 
Solaris Additions: added support for X.Org Server 1.10 
Guest Additions: fixed inappropriate Guest Additions update notification when using vendor-specific version suffixes (bug 8844)