I'm moving a family member from Windows Live Mail to Outlook/Office 365. I exported the mail from WLM into Outlook 2007. Then exported that to a PST and imported it to Outlook 2016.
The problem is now every single one of the 3,000+ messages, generates this pop-up when you click on it:
The custom form cannot be opened. Outlook will use an Outlook form instead. The object could not be found.
I only get this error on imported emails. New ones are fine. When I turn on the Message Class in the view for the inbox, messages that generate the pop-up have the Message Class ???? and everything that is new of course is IPM.Note
How can I fix all of my imported messages to get rid of that annoying pop-up? I sync'd the mailbox (IMAP) with gmail... then deleted my outlook profile and let it pull the mail box down from scratch thinking that would reset the message class, but I didn't. I'm at wits end!