If you need to access VirtualBox shared folders from a Windows Server 2008 guest OS, do not use the Network entry in Windows Explorer to map a network drive, since you will not be able to view the share.
The easiest way is to load the command line in Windows Server 2008, and assuming your VirtualBox shared folder is named sharename, execute the following command to map the shared folder to drive x.
net use x: \\vboxsvr\sharename
Great
works fine
Thank you