Well, I was thinking to add additional 4 Gigs or RAM into my Windows Home Server and wasn't sure it can handle it, since it is available only in 32 bit version. So after searching around, I found this link from MSDN explaining memory limits in various Windows systems: http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx Short answer to my question - WHS (and Vista BTW) supports up to 4GB of RAM. Technorati Tags: Windows Home Server, WHS, Windows, RAM