Contents of Sent Items disappear

Question

Exchange 2019, on-premise.

Office/Outlook 2016 - we do not use Office 365 or Outlook.com

User was in Outlook last night; all normal.

Got in today - entire contents of Sent Items have disappeared.

User did not delete anything. No (former) Sent Items found in Deleted Items folder.

No Outlook rules in place involving Sent Items.

No Retntion Policies applied to this malibox from EAC/Compliance Management

No changes made to mailbox from EAC at all

User created a few new emails today, and those are appearing in SEnt Items, as usual; problem is that everyting there prior to today has disappeared.

Tried checking from OWA - not seeing them there, either.

What could have caused this? Can we get them back?

Answer 1

Hello - thank you for the reply.

I tried both of those - no effect.

I went into Recover Deleted ITems, and none of the missing Sent Items were there.

I also created a new profile - still nothing.

As Admin, I also gave myself Full Delegate rights to see her mailbox to see how it looked to me, and the folder is empty for me, too.