Outlook keeps updating cached headers
For more information about Cached Exchange Mode, see the Use Cached Exchange Mode section of this article or the See Also section.
By default, Microsoft Office Outlook 2007 uses Cached Exchange Mode.
Cached Exchange Mode allows you to work uninterrupted if your server connection is lost or if a network connection is not available.
The procedures that follow in this section are not applicable to your configuration.
The next time that you establish a connection to the server running Exchange, the offline folders are synchronized.
Offline folders are stored in your Offline Folder file (.ost), which is different from a Personal Folders file (.pst).
When configured using RPC outlook says it is connected but says "Updating Inbox" and does not download email.
Note: If you are using Cached Exchange Mode, you are always working with an file even when you have an active connection with the server running Exchange.
Tip: To quickly designate a folder for offline use, click the folder in the Navigation Pane, and on the Tools menu, point to Send/Receive, point to Send/Receive Settings, and then click Make This Folder Available Offline.