Previous 1 2 3 4 5 6 Next 79 Replies Latest reply: Jun 11, 2013 10:41 PM by lachlanfrommelbourne Go to original post
  • Collaboration Level 1 (0 points)

    We opened a case with Apple and Microsoft as well.  Apple needs to step up to the plate and fix all of these calendar issues. That arrogant stance is not sitting well with Enterprise customers.  Fix is Apple!!!

  • Turismon Level 1 (0 points)

    Yeah, really, this isn't the only iPhone bug either, I've had plenty of magically dissapearing calendar entries from meeting updates etc. crop up and it always ends up being the persons iPhone causing the problem.

  • Small1ng Level 1 (0 points)

    I might have found a temporary solution that worked for a day now. Excuse me for my bad English, but this is what we have done:


    On the settings menu go to Email, contacts and calander.

    Scroll down to Calander's and check if 'New invitation alerts' is activated (On).

    If so, disable it.

    Scroll down a bit further to 'Shared calendar alerts' and disable it.


    We're testing this settings since yesterday on 3 of the 5 users with calendar problems. Today we will configure the other iPhones. One of them cancelled an appointment last night. Just like the bug we know since ios6.

  • LisaNB Level 1 (0 points)

    We starting having this same issue on Friday, October 5, 2012.  We are running Exchange 2003 and Exchange 2010. Users declined the message in Outlook and cancellations were sent to everyone and the organizer was changed to them.  It's now missing from people's calendar's and the "new" organizer is getting the replies.  It seems to be spreading and really starting to mess things up!  They did not accept or decline the appointment from idevices but they do have iPhones and iPad that were updated to iOS6.  I'm currently working with Microsoft but no resolution yet.

  • singebad Level 1 (0 points)

    For those of you who have Apple cases open, can you please reply back with the case number? I'm in communication with my contacts at Microsoft and Apple is asking for case numbers. I have not personally opened a case with Apple support.


    If you can supply these, it may assist in getting more exposure on this issue.



  • BishopTJ Level 1 (0 points)

    For the benefit of the thread, I received the following notification from my Microsoft TAM this morning.



    Microsoft continues to work with Apple regarding an issue where meeting attendees with iOS6 devices are sending cancellation requests to other attendees in the same meeting.  The cancellation should be received only from an organizer.


    Problem Definition

    A meeting in attendee’s calendar no longer recognizes who is the meeting organizer.



    This is also known as an “organizer hijack” and it only happens to attendees synchronizing their mailbox with iOS6 devices and who do not have a delegate.  The organizer information in Outlook and Outlook Web App is not changed in this scenario.  If actions are taken on an appointment item by using an iOS6 device, when “the organizer information is lost,” the device might incorrectly assume that the current mailbox user is the organizer.  This particular user sends meeting updates and responses as if this user was the organizer.



    This could lead to scenarios were an attendee sends a cancellation or update to all attendees when they did not organize the meeting.


    Steps to Reproduce

    1. 1.       A meeting organizer sends a meeting request in Outlook to an attendee who has a delegate.
    2. 2.       Confirm that the meeting request synchronizes to the attendee’s device.
    3. 3.       The attendee’s delegate accepts the meeting request in Outlook.
    4. 4.       The meeting organizer sends a meeting update in Outlook to the attendee.
    5. 5.       Confirm that the meeting update synchronizes to the attendee’s device.
    6. a.       Select “Close” in the notification windows in iOS6
    7. b.      Tap to select the meeting update in the Inbox but do not take any action
    8. 6.       The attendee’s delegate accepts the meeting update in Outlook.
    9. 7.       View attendee’s calendar in iOS6 after a sync.



    iOS6 shows the meeting in the calendar having no attendees or organizer.  It looks exactly as a single appointment.


    Additional Information

    For Exchange 2010, collect the calendar diagnostic logging for the particular meeting

    1. a.      Reference
    2. b.      Sample command:    Get-CalendarDiagnosticLog -Identity User1 -Subject "Meeting Subject Line"
    3. c.      You should process the MSG files this creates with CalDiagViewer.  This can be downloaded from http://toolbox/CalDiagViewer
    4. d.      Review the timeline tab to determine the last modifier of the meeting request


    Verify that automateprocessing is set to true for the mailboxes in question.

    1. Exchange 2010Get-CalendarProcessing mailbox_name | FL automateprocessing
    2. Exchange 2007 - Get-MailboxCalendarSettings mailbox_name | FL automateprocessing



    NOTE:  These are long standing “best practices” recommendations for Outlook and Calendar best performance.  See


    1. 1.      Update the delegate and manager pair to the same version of Microsoft Outlook.  The version should be Outlook 2007 Service Pack 2 or a later version.
    2. 2.      For Exchange Server 2007 and 2010, enable the Calendar processing on the server per
    3. 3.      For managers, make sure that only the delegate receives the meeting requests and responses.
    4. 4.      In addition, we recommend enabling the Exchange Calendar Repair Assistant (

      To configure this feature, use the following document:
    If it is currently not enabled for all users, and you want to implement for a single user at a time for testing, use the following document:  



    If you have any questions regarding this information, I recommend creating a case with Microsoft support.  Please note that this case is not free of charge if the issue is being caused by the third party OS.

  • Shaggy2002 Level 1 (0 points)

    I have gone through the checklist provided by BishopTJ and I found that only 5 users in my organization are not set to automateprocessing.  One of the 5 users is the only user so far that appears to be affected by this bug of cancelling other meetings that other people are organizers to.  This particular user also has a delegate that responds to all of his meetings for him.  I have updated that user to now autoupdate rather than none and hope that this will correct the issue.  Thanks for your help BishopTJ!

  • Turismon Level 1 (0 points)

    Would love to get my hands on that caldiagviewer but the download link doesn't work and can't find it online .

  • fausttiger Level 1 (5 points)

    This is very similar to an issue we have under iOS5...  Exchange 2010...


    1) Person from outside your organization sends an invite to someone inside your organization

    2) someone forwards the invite to you

    3) you respond

    4) YOU are converted to be the organizer...

    5) and now being the organizer, everyone gets a reply from you... as the organizer.   Then they start replying to you!


    For Exchange invites from outside our organization (as opposed to internal meetings),  we mostly use Outlook 2011 to accept... or risk corrupting up the invite for all.



    Note to BishopTJ:

    So... If your people also being converted TO THE ORGANIZER... hence, when you decline, you cancel the invite for everyone?    Since when you cancel (delete) your now own meeting, it sends a cancellation notice to everyone on the list.

  • atlauren Level 1 (0 points)

    We had a similar event occur at my site.  In this case it was between two Exchange installs, on different GALs.  Both orgs are on Exchange, on CAS and Mailbox servers.  The user who sent the cancel was invited via a valid SMTP address that happened to *not* be his windowsemailaddress.


    I'm chasing a theory that this is actually an iMIP/iTIP issue in Exchange, and not necessarily an iOS issue.   It could be that Exchange permissively allows EAS clients to do something in appropriate, but fundamentally the calendar system should NOT permissively allow the hijacking of meeting organizer.


    If you've seen this happen:


    Are organizer and user-who-cancels on the SAME Exchange org and GAL?

    Was the invitation sent to their windowsemailaddress?

    (Or perhaps another proxyaddress?  or a valid Sendmail address that is NOT their windowsemailaddress?)




    higher ed IT guy

  • fausttiger Level 1 (5 points)

    Andrew /atLauren


    While it happens on my iOS 5.x iPhone... I believe it also happens on Lion iCal and/or Mail.   So not necessarily iOS.  However Outlook 2011 Mac appears safe to accept invites from outside your Exchange.     Receiving a 'forwarded' invite also appears to be a factor, but not clear that's the only case.


    So  sender and replier are NOT in the same Org.


    I should note again my experiences are all with Exchange 2010.

  • fausttiger Level 1 (5 points)



    per your Microsoft TAM



    This is also known as an “organizer hijack” and it only happens to attendees synchronizing their mailbox with iOS6 devices and who do not have a delegate.  The organizer information in Outlook and Outlook Web App is not changed in this scenario.  If actions are taken on an appointment item by using an iOS6 device, when “the organizer information is lost,” the device might incorrectly assume that the current mailbox user is the organizer.  This particular user sends meeting updates and responses as if this user was the organizer.


    Well... this also happens under iOS 5.x... the organizer hijack. 


    And it also happens with Office365 , which is Exchange 2010 managed by Microsoft.  (the only exchange we're using right now)

  • atlauren Level 1 (0 points)



    If your sender and receiver are NOT in the same org:


    Was the receiver invited via the SMTP address that is the SAME as his windowsemailaddress?  (aka Exchange's primary SMTP address?)




  • fausttiger Level 1 (5 points)

    Well, sorry for a long answer, but let me state the setup:


    This is an Office 365 setup, so the Exchange 2010 server is maintained by Microsoft.


    The receiver is OS X Lion mail/iCal   and/or iPhone iOS5.x ... so only Mac users have seen this (when they are not regularly using Outlook 2011).


    We don't have problems if the invite is received/replied via Outlook 2011, apparently even if the user has an iPhone.


    We have all our organization's email addresses in our Office 365 / Exchange 2010 directory, but people are mostly not syncing all their external contacts.


    So, often when I've seen this... the invite has been FORWARDED to the problem receipient..  so technically their windowsemailaddress (if that applies in this case) was not in the original invite (since someone forwarded the invite).

  • singebad Level 1 (0 points)

    Has anyone tried Step 2 or Step 4 of the workarounds posted by BishopTJ? I'm not sure what the impact of enabling the Exchange Calendar Repair Assistant for our affected mailboxes would be, but intend to perform some testing soon. Has anyone used this?


    Also, from what I've heard, this issue has been around since iOS 5... but it appears iOS 6 has been a catalyst for more of the same issue(s).