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Last week we've transitioned from our POP3 email provider to Office 365 for Business. We have 30 users and started a mailbox copying and synchronization batch job on their new mailboxes. As of today there are only 4 mailboxes left which are still synchronizing. We have a very slow (1 mbit) upload bandwidth so we did expect a long completion time.
Our problem is that some of our users whose synchronization jobs have already finished do experience some strange behaviour with email delivery.
One of them did try to check his inbox on the weekend at home. He couldn't see his daily email traffic in his inbox and so checked his OWA account to confirm it. His OWA inbox was empty, too, so he assumed that it was the real thing. After turning on his laptop and firing up his desktop Outlook application he could see a big amount of emails in the inbox. After opening the desktop app his phone did begin to get those emails, too, and when he went to his OWA account he saw them in there, too.
Another user did send some emails from his Gmail account to his Office365 account and checked his phone app to control the inbox. He didn't get the emails. He went to his OWA account to check them and those emails were in there. After awhile when he opened his desktop Outlook app his phone started to get those emails. He went through this process a couple of times.
Those problems haven't been reported to me by all our users. Only a few of them did experience them.
It seems like that the desktop Outlook app is somehow triggering the mail flow.
We have some other minor glitches but our main focus is with these problems right now. I couldn't find any exact or similar reported problems on MS forums or here. Our channel partner only responds with classic answers which mainly focus on the unfinished company wide Office365 synchronization issue. I don't believe them because one of our users did experience this problem on his home connection and that user's synchronization was finished.
Did anyone else have had these problems, and if so how did you solve them?
I'll accept your answer because it includes the most detailed control steps. But our problem wasn't solved with them. We opened some tickets to MS support but they didn't solve them, too. These problems were gone after a few days without anyone interfering. We are still observing our mail flow. – Montag451 – 2014-07-23T06:07:42.093