How to use the Outlook 2003 forms cache and to troubleshoot forms cache problems

The solution at the following:

1. On the Tools menu, click Options, and then click the Other tab.

2. Click Advanced Options.

3. In the Advanced Options box, click Custom Forms.

4. In the Custom Forms box, click Manage Forms.

5. In the Forms Manager box, click Clear Cache.

Reference:

http://support.microsoft.com/kb/839804

How to use the Outlook 2003 forms cache and to troubleshoot forms cache problems