Outlook 2007 Slow - Switching between Mail, Tasks, Calendar

[Richard]

I am using Outlook 2007. Vista Home Premium, 4 MB of memory on a new HP laptop.

When I try to go from mail to either my calendar, tasks, or contacts, it
most usually takes at least 10-15 seconds to switch. The pointer turns into a
circle and just spins.

I've tried unchecking all add-ins. Same issue, even after compacting my
PST's and running Scanpst.

I have 4 personal folders my regular Outlook PST, a Gmail account (Imap),
and email accounts for work (one set up to send work email from home): the
largest is 61,000 KB.

Any idea on what may be causing this problem? I did not experience this in
2003.

Thanks,

Richard