0
We have a shared inbox that we use. There are two users that access this and both are reporting that after writing/sending a new email, the inbox shows no emails in it. They have to go to another folder then back to the root inbox and all the emails are back there that should be.
We've tried resetting the view of the inbox to see if there's a setting that could be hiding items, but nothing seems to make it stay permanently. Additionally, it is semi-random that this happens. They could send 5 emails and on the last one everything disappears, but the other 4 were fine.
The solution for this turned out to be a misconfiguration in O365. There was a cloud exchange email proviosned for the user as well as an on prem email. – Crumblez – 2019-08-08T17:34:20.257