One of our callers today, Jeff, couldn't get forwarded emails to open if they were attachments. We believe this method may work to rectify the situation:
Use the following steps to use the Clear Cache button in Outlook:
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.