YES, Windows Server 2003R2 was the best version of Windows ever. I worked with it professionally for about 8 years, if you just used MS software on it (exchange sql server etc) that thing NEVER crashed, when we deployed a 2003R2 (as opposed to a 2008/2008R2) we referred to it as deploying the VMS (openVMS).

BTW: However, i never used the 2003 64-bit version.