Happening to 2 reported users. It appears a new mailbox solved the 1st persons issue.
Email arrives on phone (via activesync) notices it then disappears a few seconds later. In testing, this only happens when outlook is open.
Outlook closed: Email arrives on phone and webmail and remains there as normal.
Outlook opened: Email arrives and shows up on webmail and phone but does not appear in outlook. Soon thereafter email is gone from webmail and phone. This does not happen to all emails. Tested from gmail, yahoo, and internal. So far internal emails don’t seem to be affected but not positive.
Notes: - No outlook rules seen - Mail Delivery has is set to OST and not PST as NOT ALL new emails disappear - This is a legacy mailbox (Exchange 2003) - No known antivirus activity @ email servers - Spam soap lets the email thru normally and is why it arrives at exchange server ok - No sign of ESET client activity at user (Nothing in logs)