my Dell Inspiron 6400 behaves very strange way.
When I start Outlook 2003, it's process CPU load jumps between 0 and 20% and explorer.exe process jumps between 0 and 60%. The peaks are in about 10 seconds intervals.
In this state, any click on task-bar or desktop takes 3-5 seconds to react.
When Outlook is not running, explorer behaves normally and CPU load is at usual level (0-3%).
All recent updates and service-packs for Windows and Office are installed. Outlook is configured with POP3 account and connecting over LAN.
Any help appreciated.