Win2k Server and SP3

I’m just wondering what issues exist while installing SP3 on a Windows 2000 Server. I have a Win2k domain controller running Exchange 2000. I’m running IIS on the same machine to host Outlook Web Access. Most things are working fine. I have justone problem – the ‘www’ alias for my primary domain is not resolving properly. I get the default site instead. It has been recommended that I install SP3. Has anybody had a good experience doing this? What has MS done with that ‘security roll-uppatch’ (the patch of death)? Is it included in SP3? Your input will be appreciated.