Outlooks shows "installing forms" message and then can crash. You can not open a stubbed message on Outlook 2003 SP2 machines as soon as upgraded Archive Manager from 3.6.* to Archive Manager 3.7. Reinstalling custom forms v.3.7 does not help as it gets replaced by Outlook form v. 3.5.1.
The old Archive Manager Offline client resides on Outlook 2003 SP2 conflicting with Outlook Forms 3.7.
Uninstall offline client and re-install Archive Manager 3.7 Outlook form.