Our Exchange 2007 installation is having major performance problems. Outlook 2007 just sits and hangs for people, delays when typing, even crashes. Exchange Troubleshooting Assistant shows Extremely high RPC user activity anywhere from 25 to 75 - not .25 but actually 25, but we can't find the source of this. Have tried disabling our spam/virus scanner. Where else should we look?
Running SBS 2008, Symantec Mail Security for Exchange, 15 users, High end Dell server