outlook.ost has detected a caltalog checkpoint

[Guest]

When I switch between wired and wireless networks, my Outlook client becomes
disconnected from the Exchange server and registers the following message in
the event log:

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 32
Date: 5/17/2007
Time: 3:45:55 PM
User: N/A
Computer: 99IOTHJK22C1
Description:
The store C:\Documents and Settings\jstipe\Local Settings\Application
Data\Microsoft\Outlook\outlook.ost has detected a catalog checkpoint.

I never lose network connection, wired or wireless, and I can reach the
Exchange server through OWA. It seems that after a timeout period it will
reconnect and operate normally.

Can you point me to a solution?