I have a client who subscribes to hosted Exchange, In addition to her normal hosted Exchange folders (inbox, sent items, etc.), she has a very large PST file of mail that she uses as an archive. This 2.5GB PST is in her Documents folder, which is synced to a local SBS 2008 server.
She suffers occasional huge delays even when she is doing very basic tasks (usually not associated with the archive PST file). However I notice that the file timestamp on the archie PST is updated every few minutes.
Is it possible that this PST file in her documents folder could be causing slowness issues? When this company was running their own Exchange server, there were no such delays.