Office 2004 running slow on macintosh lap...

Both Office 2004 and OS are up to date. 2ghx intel Core Duo, 2gb ram, running 10.4.10, also running Office 2004, 11.3.7.

Have boss that is extensive user of Office (both Word and Entourage). He is attorney and needs to keep all 3.5gb of emails (he has all he ever sent since company founded, not option to archive, and has to use spotlight to search for emails).

But, we notice that his system runs slow. When he tries to type email or word document, the letter are delayed greatly (about 30 seconds). Even if both applications or running, any new document or email will have delay. And delay will happen during the creation of the doc or email.

In activity monitor, nothing is cpu hog. Word or Entourage or Database Daemon will not be more then 20% (one at time).

Any help appreciated.