Memory usage of SAVFMSECTRL.exe on Exchange Server 2003

I've got an Exchange 2003 server with 3 GB of RAM in it for approximately 100 mailboxes.  We're using Symantec AV Enterprise for anti virus.  Every so often, the memory usage of the SAVFMSECTRL.exe gets up to almost a gig, and with the store taking up almost a gig, and inetinfo.exe taking about half that, the
Exchange server gets really slow.  There are also at any given time about 10 copies of the SAVFMSESp.exe running.  I apologize if this question should be somewhere else besides the Exchange area, since it really deals with Symantec AV, but since it's running on our Exchange server, and affecting performance on that server, I thought I'd try here:  What is causing SAVFMSECTRL.exe to grab so much memory?  Is there a preferred method to getting it to release those resources, other than ending the process, and then waiting the minute or two it takes to restart?  Why do 10 instances of the SAVFMSESp.exe occur?  Is this normal?

Thanks!