Outlook 2010 Problem: error message "Apple.DAV.Appointment" cannot be opened...


  • When my appointment reminder window openes and I cancle a reminder I get a popup that says:

    Microsoft Outlook
    The form region
    "Apple.DAV.Appointment: cannot be opened. The form manifest specifies and add-in that is not installed.

    When I dismiss and apointment this error pops up.

    I called Apple to see if it had anything to do with their software and they researched it and said not but they did say they had learned it dealt with reocurring appointment.  That is a lot of what is in the calendar. 

    Any help would be a ppreciated is solving this. Geeorge Payne 334 222-9212

    George Payne

    Friday, February 22, 2013 6:43 PM

All replies

  • Do you install any Apple add-ins or use Form which is created by Apple in Outlook? Try to launch Outlook in safe mode. (Tpye "Outlook.exe /safe" in Windows search bar and press Enter" and check whether you can reproduce it. Thanks.

    Tony Chen
    TechNet Community Support

    Monday, February 25, 2013 10:34 AM
  • Same error here, but this time with Outlook 2013. Any ideas on how to start the troubleshooting process?
    Wednesday, February 27, 2013 8:14 PM
  • I had the same problem with Outlook 2010. I upgraded last week to 2013 but this message is still popping.
    Monday, September 23, 2013 9:30 AM
  • Same problem here. Outlook 2010. I believe this just started yesterday or the day before.

    Did recently upgrade iTunes.  Is that relevant?


    Thursday, September 26, 2013 10:03 PM
  • Unfortunately I have the same problem, I work with Outlook 2010. I all happened after installing IOS 7 for my Iphone, so there must be a connection? Please help
    Monday, September 30, 2013 1:43 PM
  • I have the exact same problem, using Outlook 2010
    Wednesday, October 02, 2013 8:05 AM
  • I have the same problem with Outlook 2010. It seems to have started after I upgraded my iPhone to OS7, as someone else commented. When I launch Outlook in safe mode I do not get the pop-up error message.
    Thursday, October 03, 2013 2:06 PM
  • I would recommend disabling the iCloud Outlook Add-in by going to File > Options > Add-Ins, and then going into "COM Add-ins" to uncheck that item and disable it.  I know the new iCloud Control Panel recently got installed on my machine during the iTunes update, and this took care of it in my case.
    • Proposed as answer by drylander Wednesday, October 09, 2013 4:41 PM
    Thursday, October 03, 2013 3:42 PM
  • Thanks for your answer Vince - that fixed it for me! 
    Friday, October 04, 2013 5:04 PM
  • Same error here, but this time with Outlook 2013. Any ideas on how to start the troubleshooting process?

    Tuesday, November 19, 2013 2:50 PM
  • Outlook 13; try  file/options/add ins/manage add ins/tick itunes outlook add in/click OK.

    Worked for me.


    Sunday, December 22, 2013 11:37 AM
  • When I was starting to follow the suggestion, I discovered that the Apple I Tunes add in was NOT checked.  With both the I cloud control and the itunes add in checked, the error went away.   
    Sunday, January 05, 2014 6:41 PM
  • I encountered this problem after upgrading from 2010 to 2013. It occurred when I only had iCloud checked and not iTunes. Having either both unchecked or both checked fixed the problem.
    Thursday, February 06, 2014 1:40 PM
  • I just spent the morning fixing this problem on Outlook 2007.  I have no idea why it started, since I hadn't upgraded any Outlook or Apple software recently.  Maybe it was the latest batch of Windows 7 updates?  The solution was to enable and check both the iTunes and iCloud add-ins in the Trust Center.  FYI, here's how I arrived at that conclusion:

    I tried disabling all add-ins and re-enabling them one by one, but that didn't fix the problem.  I upgraded iTunes, but still no joy. I noticed that neither the iTunes nor iCloud add-ins were checked in Outlook (they hadn't been for months, maybe years). I tried disabling both but that didn't help.  I tried removing them, but that didn't work, either (and I had to figure out how to add them back in).  Finally, I tried enabling and checking them both. That did it.

    FYI, I don't use iCloud to sync my data.  I tried that once and it destroyed my Outlook calendar.

    Monday, July 14, 2014 7:56 PM
  • This worked for me, TY.  (I had to run Outlook as administrator to disable it, right click Outlook shortcut and run as administrator)
    Tuesday, August 12, 2014 12:51 PM
  • Disabling the iCloud outlook add-in worked for me too. Thanks!
    Monday, December 08, 2014 7:24 PM
  • Thank you!  

    Anyone reading this thread should follow the above steps to disable the iCloud add-in.  Did the trick for me.


    Thursday, April 23, 2015 5:48 PM
  • I delete all Apple products including ICloud and have this warning. There is no outlook addin with an apple name  and still no joy.

    Sunday, September 27, 2015 3:30 PM
  • The same, I got error when I deleted all Apple products on my Windows 10 desktop. Just a warning but it is annoying, want to get rid of.
    Wednesday, December 02, 2015 3:39 AM
  • Same problem in Outlook 2010, no apple products to disable.
    Friday, December 18, 2015 3:52 PM
  • Thanks, drylander. That fixed it for me, too!
    Sunday, March 27, 2016 2:08 PM
  • Hello Vince,

    I know that this is an old posting of yours, but I have tried to disable it, but I am told that I must be an Administrator of the PC.

    Guess what, I am the Administrator.

    Can you help me please?

    Wednesday, July 13, 2016 3:41 AM
  • Go to start menu, scroll down to Office, then right click on Outlook, select properties, change settings for all users and set to run in administrator mode - this should now allow you to delete unwanted add-ins
    Thursday, October 06, 2016 7:34 AM
  • I was hit by this problem when I finally migrated to Windows 10.

    Syncing my calender, contact etc via iCloud also did not work anymore. (essential for my set up)

    I look at the Addin , all seem enabled.

    Then I started Outlook as Admin (as described further down, going to the shortcut, left click strat as admin)

    When it started a pop-up gave me choise to actiaved or deavti9vaem all Add-Ins. I actived all and hurray, Outlook worked with iCloud as it should. All good. now

    Thanks to all for the various options to try

    Tuesday, July 04, 2017 10:00 AM