mine is Win. XP SP 2 ... much compatible to run an MU Server but you need a good processor.
On my old mu server i used Windows Server 2003 Enterprise SP1 - I believe it's the best for mu servers, never had a crash related to the OS.
*used scfmt's files tho*
Windows Server 2003/Windows XP.
I'm using Windows Server 2003 R2 SP2 Enterprise Edition.
I've hosted all versions of MuServer on it already and didn't have any problems.
I saw alot of people a saying they have trouble using Windows Server 2003 R2 SP2 Enterprise edition ,cause many programs used to crash for them.
Personally I didn't have any problems yet and if I did have problems they were not O.S side problems.
So I can recommend you Windows Server 2003.
Windows Server 2003 have tickrate 66, some server files need 1000, so Windows Server 2008 can solve that problem, because has 1000 MS tickrate. Happened to me with 2003, an error disconnects users massivly because of that. (Zemattana told me about it)
it is possible to run OS winserver2k3 and SQL2k?
or required of winserver2003 is SQL2005?
window server 2003 Is the best..but its depend on your server file..some other cant run in window server 2003
Mac Os ^^
Man the best is Win Server 2003 Its the secure and the best one for MU i think an old Mu Friend told me 64 bit is best but i dont know that i know that i am from a lot years with 2003 and i dont have no problems so if y want y can try 2003 you wont regret it :)!
People, what OS, what SQL do you use and how much does SQLSERV.exe proccess consumes you?, thanks.
Windows server 2003 x64 edition.