I’m sure we can chalk this up to “webmaster error”, but as of this posting, there are no ArcGIS Server posts prior to today. Now is your chance to become ArcGIS Server MVP! ;)
Seriously though, I assume this is a result of creating a new ArcGIS Server forum for the combined ArcGIS Server and ArcSDE and then just removing the old forum from the list. I can’t imagine that everything is lost and I bet you’ll see an ArcGIS Server 9.1 forum appear soon.
As of right now, if you search for any information about ArcGIS Server, you get only the results for 30 posts. That is right, only 30 forum posts exist right now for ArcGIS Server on the support site. People are going to be grumpy.
**Update - **from the comments:
We are working on restoring the old forums threads now and sincerely apologize for the inconvenience.
**Update 2 - **from the forums:
Hello ArcGIS Server users,
All of the old posts have been republished to our site, and we will be working to fold them into the new structure.
Our apologies for the confusion and any inconvenience caused by these changes.