When you are developing custom forms for Outlook or when you are a user within a company that has its own custom forms, you’ve probably ran into the error “Outlook cannot open this form…” message on some occasions.
In that case, you’re only solutions it to clear the Forms Cache and try again.
Unfortunately, clearing the Forms Cache is quite a longwinded process. Especially when you are a Custom Forms developer, you’ll probably find yourself clearing the Forms Cache on a regular basis and find it quite time consuming.
The script in this article can be used to quickly delete the Forms Cache.
Continue reading: Script to clear Outlook’s Forms Cache