If you run a Blackberry Enterprise Server and Groupwise, you've likely run into the following error on your Blackberry handheld:

Embedded message text insertion is disabled

This only happens when an email is forwarded as an attachment. If you forward the email normally (as text) the issue doesn't occur. Apprently the BES thinks the forwarded email is an "unrelated embedded object" according to their KB article.

1. On the computer which hosts the BlackBerry Enterprise Server, open the Registry Editor.
2. Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Research In Motion\BlackBerry Enterprise Server\Agents.
3. Create a new DWORD value called DisableEmbeddedMessages.
4. Right-click the DisableEmbeddedMessages value, and click Modify.
5. Set the value to 0 in hexadecimal format.
6. Click OK.
7. Close the Registry Editor.
8. Restart the BlackBerry Controller service

Read more here.