Try uninstalling and reinstalling the Exchange Extensions, but only if connected to an Exchange server. If you are not using one, then uncheck the options in Add-in Manager.
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Hasheef asked:
| While opening outlook one error message poping up .Message is "The
| file ad in MSFSMENU.ECF or MSFSPROP.ECF is missing".