Exchange 2013 - Meeting Invite from external contact is internally processed and received hundreds of times per day for one user

Posted on 2014-07-15
Last Modified: 2014-09-20
One of my users gets the same invite to attend a meeting hundreds of times a day. The invite was originally sent from an external contact (outside our Exchange 2013 / AD setup) and I can see that this external contact sent the request only once. The repetition is happening within our system, and the invite generated each time is identical to the last.

Somewhere within Exchange something is not right. This replication happens regardless of whether Outlook is open, and whether there are iOS devices turned on and syncing or not.

I've some vague high concept ideas what might be happening, but if anyone could give me technical specifics to carry out in PowerShell or the EAC to try and fix this, I'd be most appreciative!

Many thanks :-)
Question by:bluemercury
    LVL 63

    Expert Comment

    by:Simon Butler (Sembee)
    "...there are iOS devices turned on and syncing or not..."

    That would probably be the culprit. Calendar handling on iOS with ActiveSync is very poor and shouldn't be used (ie don't do anything with the calendar on the device at all).
    It has probably looped and the messages are queued.

    Going to be blunt here - wipe the iOS device and remove the ActiveSync partnership. Wait for the messages to flush out completely. Then resync.

    All the time the iOS device is active or configured for the mailbox I wouldn't look anywhere else for the cause.

    LVL 1

    Author Comment

    Hi Simon.

    Sorry, EE didn't tell me there was a message from you!

    Had already tried what you've suggested when I posted, as read a lot of people saying iOS was a royal pain on this. We left it a good few hours with no ActiveSync engaged (account deleted) and the single iOS device the user has turned off. Still the repeated meeting invite messages came in.

    Would you suggest we try it for a whole 24 hours, to see if it stops? Otherwise, I was going to delete and recreate the user mailbox (backup, PST export first).

    Incidentally, the troubles began after a Veeam backup crashed out a load of our VMs. This does make we wonder if it is little to do with ActiveSync and more to do with some internal issue on Exchange.

    Many thanks,

    LVL 1

    Accepted Solution

    Quick bit of follow up:

    We removed all instances of the user's ActiveSync for a whole week. Problem still happened. I have indentified that it is probably something wrong in the Outlook 2010 client or the Outlook profile. The user went away on holiday for 5 days, only using ActiveSync on their iOS device (having reinstated). No problems at all. Having got back, the invitations started again as soon as they fired up the Outlook client. They have two instances of Outlook - one on their workstation, one on their laptop, so I'm investigating whether it is either or both and trying to fix this now.

    Thanks for your efforts in trying to help - from all I read iOS was looking the likely culprit, but in this case seems to have been the device not causing trouble!

    LVL 1

    Author Closing Comment

    Worked out on my own accord that the problem is with the Outlook client....

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Maximize Your Threat Intelligence Reporting

    Reporting is one of the most important and least talked about aspects of a world-class threat intelligence program. Here’s how to do it right.

    Find out how to use dynamic social media in email signatures with this top 10 DOs & DON’Ts.
    Not sure what the best email signature size is? Are you worried about email signature image size? Follow this best practice guide.
    In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…
    The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

    759 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    13 Experts available now in Live!

    Get 1:1 Help Now