some sent emails are missing and moving to "recover deleted items"

spring8080 

When I say working users, I mean users who are not affected by this.

It is not normal that emails that appear in the sent items folder to also appear in the recoverable items folder. This must be an outlook misconfiguration. Can you confirm the behavior after the accounts were completely removed from their mobile apps.

Outlook is probably generating copies of sent items which is getting deleted. So, we need to confirm, if normal sent items are showing in the deleted items folder (not the one that occurs while working with Excel File).

In addition, check if the Don't save copies of sent items check box is unchecked. If it is unchecked, try checking it following the steps below:

• On the File menu, select Account Settings > Account Settings.
• Choose the IMAP, and then select Change.
• Choose the Don't save copies of sent items check box.
• Select Next, then Done.

Try all of this and let me know if issue is resolved. Thank you!