How to Prevent/Troubleshoot “Calendar items missing” issue

In Outlook 2003, some customers may meet the “Calendar items missing” issue. There are several factors that can cause this problem and therefore, the whole troubleshooting process may be time consuming.


At this stage, we’d like to provide some tips to help you prevent such issues. The following tips are from analyzing many “Calendar items missing” issues:


1.     Keep your BlackBerry and GoodLink server updated

2.     Keep your Outlook and Exchange server updated

3.     Keep the manager and the delegate using the same version of Outlook

4.     If possible, make the manager and delegate’s mailboxes in the same store

5.     Avoid sending meeting request to a Distribution List (we can expand the DL first)


Additional best practices can be found in the following articles:


Outlook meeting requests: Essential do’s and don’ts


Considerations when you use the Delegate Access feature in Microsoft Outlook


Also, we’d like to provide some troubleshooting guides for “Calendar items missing” issue. Please refer to the following useful articles when this issue occurs.


How to troubleshoot missing and duplicate appointments in Outlook


Description of common scenarios in which Calendar information may be removed from the Calendar or may be inaccurate


Finally, in Outlook 2007, we have redesigned the calendar portion; our goal is for no one to ever miss a meeting. With the spread of Office 2007, the “Calendar items missing” issue will disappear once and for all.

Comments (5)
  1. Sarita Ruth says:

    my windows explorer calender is missing after running advanced registry optomizer. i reinstalled internet explorer and it says still missing. can you help me please and thank you.

  2. Leonard says:

    With the spread of Office 2007, the “Calendar items missing” issue will disappear once and for all.

    Not so lucky.  I have this issue with Outlook 2007.

    Any monitoring tools you recommend.

    Please email



  3. John says:

    yup; outlook 2007 and 2010 beta having stuff dissapear still. Bold statement i guess.

  4. colleen says:

    Calendar items still disappear in Outlook 2007. The Essential DOs and DON'Ts is a little ridiculous. If I'm not spposed to forward a meeting request, don't allow me to do that. Same thing with editing single occurrences of recurring meetings. Save people from themselves Microsoft by improving your usability.

  5. Gregg Holbert says:

    I am loosing anything older than six months. We use current versions of Exchange 2007 and Outlook 2007 and 2010. It is happening programmatically because each day it increments. I will repost if I find a solution.

Comments are closed.

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