I'm trying to resolve an issue in which Outlook 2007 will frequently start
synchronizing (with what?), using over 60% cpu time (per Task Mgr) and very
noticeably slow down the computer.

Here are some details of the system:

Intel Core2Duo cpu w/1GB RAM
Windows 64-bit Vista Ultimate OS
Office 2007

Typically, within a few minutes after Outlook loads, the entire computer
noticeably slows down; send/receive in Outlook takes several minutes instead
of the usual 10 or so seconds. When I kill the outlook.exe process using
Task Manager, the cpu use drops from around 60% to the usual 1-2%.

I've turned off RSS feeds and disabled internet offline files.

Can anyone help me identify what Outlook is trying to synch with, and/or how
I can resolve this issue?

Thanks,

S