RE: If you go the Sametime 9 community server then you'll need to install a WebSphere SSC so best to go with the 8.5.2 Ben Williams 22.Sep.14 04:36 AM Lotus Notes General All ReleasesWindows
Yep, Carl is right, go 188.8.131.52. I guess you are using native Domino authentication and your current Community server is in the same Domino domain as your mail server?
With Sametime 8.5.x native Domino authentication is not supported which means that if you stick with this version so that you avoid DB2 and WAS then you will need to convert your buddy lists to LDAP format. You should also plan to create a new Domino domain for the Community server so that the address book doesn't replicate to it. This will also allow you to upgrade your mail servers independently to your Community server and vice versa.