I have a user with Windows 10, Office 2019, and Exchange 365. About 2-3 months ago she noticed her email no longer was in sync between Outlook and her iPhone. I have narrowed it down to this.
If you hit del or choose del from the toolbar on an email in Outlook it deletes from Exchange and thus from her phone.
If she hits shift-del (which she frequently does) it deletes from Outlook but does not del from Exchange and thus stays on her phone.
I tested this by opening Outlook on one screen and OWA on another and can see message stay in OWA with a shift-del but disappear with a normal del.
Never seen this one before..... Any ideas?
If you hit del or choose del from the toolbar on an email in Outlook it deletes from Exchange and thus from her phone.
If she hits shift-del (which she frequently does) it deletes from Outlook but does not del from Exchange and thus stays on her phone.
I tested this by opening Outlook on one screen and OWA on another and can see message stay in OWA with a shift-del but disappear with a normal del.
Never seen this one before..... Any ideas?