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Office 365 Exchange: Thousands of Recurring Meetings Hobbling Mailboxes

Posted on 2015-02-20
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Last Modified: 2015-02-21
Several of my O365 Exchange users have recently encountered free/busy issues.

For example...

1.) Availability greyed when another user attempts to view their cal or

2.) Outlook failing to launch as it tries to load thousands of inexplicably repeated meeting notices.

Consider the example of user Jane Doe.

Jane reports that no one can see her free/busy status.

She notes that one meeting in particular has an incredible 10,000 entries within her calendar.

I investigate and confirm by running the following via remote PowerShell:

Get-Mailbox -Identity jane.doe@contoso.com | Search-Mailbox -SearchQuery 'Subject:"Weekly Project Status Meeting"' -estimateresultonly

And this does indeed turn out to be true as the results show:

RunspaceId       : 64319ceb-197d-4f29-b8fa-81f56a99d6eb
Identity         : Doe, Jane
TargetMailbox    :
Success          : True
TargetFolder     :
ResultItemsCount : 10000
ResultItemsSize  : 57.88 MB (60,689,795 bytes)


...


To eliminate these items, I run the following:


Search-Mailbox -Identity jane.doe@contoso.com -SearchQuery 'Subject:"Weekly Project Status Meeting"' -DeleteContent

And PowerShell reports success:


RunspaceId       : 64319ceb-197d-4f29-b8fa-81f56a99d6eb
Identity         : Doe, Jane
TargetMailbox    :
Success          : True
TargetFolder     :
ResultItemsCount : 0
ResultItemsSize  : 0 B (0 bytes)


However, a subsequent query reveals that the calendar items have not, in fact, been deleted and the user's free/busy is still inaccessible.

So, my questions for the community are:

1.) What's causing this explosion of meetings above what was actually submitted?
2.) Once deleted, what's re-inserting the recurring meeting sequence into the user's mailbox?
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Question by:drmonoe
2 Comments
 
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Accepted Solution

by:
Vasil Michev (MVP) earned 2000 total points
ID: 40621658
My bet is on iOS devices, there is a know issue with those that can cause multiple 'repair' messages to be sent : http://support.microsoft.com/kb/3015401

You can turn off the Calendar Repair Assistant to stop them, or better yet, stay away from the native Mail application. Here's also the article with other known issues with ActiveSync devices: http://support.microsoft.com/kb/2563324

If you have ruled out mobile devices, check for any funny Inbox/Transport rules, add-ins that might be causing this, etc.

As for the free/busy issue, check the default permissions, check if she has issues with Autodiscover and accessing the EWS URL directly, etc. Calcheck might help detect something as well: http://www.microsoft.com/en-us/download/details.aspx?id=28786
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Author Comment

by:drmonoe
ID: 40622046
Thanks Vasil.

iOS devices are certainly playing a role since this user (and many others) are interacting with O365 via iPhones and iPads, along with Outlook 2010 on Windows machines and Outlook 2011 for Mac (with a few Outlook 2013, ProPlus and 2015 clients here and there as we roll those out).

Currently, the approved method of access for Apple gear is the OWA app for iOS (not the new Outlook for iOS app, with its controversial security issues) but I'll run some PowerShell queries to check if ActiveSync is still in-use.

I'll definitely give Calcheck a try (along with your other recommendations) and report back.
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