I'll join in completely agreeing with "Red Flag" above. Searching across mutliple malboxes that are automapped, just doesn't work. I wouldn't even say its incomplete or inconsistent, its just outright broken.

Hi @RobHulley - based on my experience, the announcement above didn't change the behaviour for search when ShareMailbox has been added as usual and preferable = with auto-mapping. The search results for "All Mailboxes" are still incomplete and inconsistent. Only when when you highlight the particula...

For Office 365 if I select to search All Mailboxes does it search the subfolders in the mailboxes? This is important for the way we have the shared mailbox setup, everything is in subfolders, the top level is empty. Thanks Rob

And how does the online archive stands in all of this, is it similar to a shared mailbox?

@miketaba - please see the similar article that applies to Outlook on Microsoft 365: https://techcommunity.microsoft.com/t5/outlook-global-customer-service/how-outlook-for-windows-connected-to-exchange-online-utilizes/ba-p/1715045