Disappearing emails exchange 2007

Question

Happening to 2 reported users. It appears a new mailbox solved the 1st persons issue.

Symptoms:

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)

Answer 1

Deleteing the mailbox and creating a new one seems like a pretty drastic measure to resolve this kind of problem. If the problem only occurs when Outlook is open then that tells me that Outlook is the culprit, not the mailbox. I would suggest starting outlook from Run using the following:

outlook.exe /cleanrules

This will remove (clean) all server and client side rules. There may be a rule that's become corrupted/hidden that's causing the problem. If so, this should resolve it.

Answer 2

Is it possible that a client-side spam filter that runs only within Outlook that is molesting these e-mails? Check your Junk Mail settings to make sure.