KB181940 - BUG: Outlook Loads Custom Form Messages with Attachments

MORE INFORMATION

The form is loaded into memory and can cause code to run that otherwise would only run as a result of a menu choice from the user.

Create a MAPI custom form that allows management of attachments and register it in the system registry.
Run Outlook 97 and Task Manager.
On the Compose menu, click Choose Form.
Select your MAPI custom form from Personal Forms, and then click OK.
Attach a file to the message using your form's file attachment mechanism.
Post to post the message to the current folder. (At this point your form will be listed as an active process in the Task Manager process view.)
End your form process in the Task Manager. (This can also be done by exiting and logging out of Microsoft Outlook.)
Right-click the newly posted message and do not make any choices from the menu.
Switch to the Task Manager to see that your MAPI form is now loaded in memory again even though you have not done anything to invoke the form.