A new client called yesterday because they couldn't connect to their SBS2K3 server over the LAN. Working it from the console yielded out of memory or similar issues, the event log was full of event 2019 issues - insufficient system resoources.
We rebooted and things are OK, but in looking at eventid.net there's talk of a memory leak with VSS and there's a hotfix for that. Regardless of that, I checked Windows update and although, under system properties, it was set for auto update at 2AM each morning, it needed Microsoft update installed and then only had 1 update it wanted to get (Sharepoint?).
Anyway, the crux of the question: Looking at system properties, it didn't have sp1.... does the OS indicate that there's a service pack like xp did for sp2? Or how would an end user know there's that big update?
WSUS is not installed. it's a small network the boss / owner set up.