Disappearing 365 Shared Mailboxes

I had and issue where O365 Share Mailboxes disappeared after a minute or so. After a bit of googling, I found this solution

Configure one of the following registry subkeys as follows:

DWORD: ExcludeLastKnownGoodUrl
Value: 1

DWORD: ExcludeLastKnownGoodUrl
Value: 1

Note: The x.0 place holder represents your version of Office (16.0 = Office 2016, Office 365 and Office 2019, 15.0 = Office 2013).

Taken from this MS Technote…..


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