Cached Outlook - how to change settings
Click on File, then Account Settings and Account Settings again
On the Email tab, highlight your name and click Change.
You can then adjust your cached settings.
If you are having performance issues with Outlook, untick this option as it is holding a copy of all mail on your PC.
ONLY HAVE CACHED CHECKED IF YOU ARE ON THE ROAD A LOT AND NEED A LOCAL COPY OF MAIL.