Outlook 2007 crashes when opening calendar view

I’ve had this problem on a couple of machines now, both were running Outlook 2007 SP3.  Outlook appears to be working normally, but if you try to access the calender it just hangs and displays “not responding” in the title bar.

Eventually you are left with no choice but to close and restart Outlook.  There seems to be several problems with this, and therefore several possible solutions.

Outlook 2007 Hangs when accessing the Calendar – useful command line switches

First, try the easy solution of starting Outlook with some command line switches, this procedure seemed to help on both machines but only fixed it on one.  I used:

outlook /resettodobar /cleanprofile /cleanviews /cleandmrecords /cleanfreebusy

There are lots of command line options that you can apply to Outlook and they are all explained here:


Access to the calender in Outlook 2007 may be blocked by some existing tasks

It seems that the default calendar view also shows the task list, and I found the tasks to be where the problem originated from, and in both cases the tasks were incomplete and not correctly filled out.

Go into the tasks tab and list your outstanding tasks, you may see some entries that are entirely blank, you may be unable to click on them or access them at all, like this:

Unable to access the calendar in Outlook 2007 when there are unfinished tasks


Not only was I unable to click on these tasks, but they were constantly refreshing like they could not be properly found.

Try changing the view so that you can get a more stable look at the remaining tasks:

Listing tasks by Category in Outlook 2007 to stop the Calendar tab from not responding


By changing the view I was able to get a stable view of the remaining tasks.  Deleting the rogue tasks, which were flagged as incomplete, but many years old solved the issue.  The calendar became accessible again.

I spent quite a long time trying various fixes to this quite basic fault in Outlook, quite a few others have experienced almost the same problem as me, so hopefully this saves someone else some time.

16 thoughts on “Outlook 2007 crashes when opening calendar view

  1. Thanks for this awesome post, I haven’t helped me but gave me the idea where to look at and I found the following which I’d like to suggest:
    I tried what the post says but no luck so as I was looking at tasks windows I realized that I have added a pst file from a network location so I thought “maybe the issue is ’cause it is looking and reading that file so as a result it’s hanging then I closed those files I had and the problem went away at least by now this fixed my problem and Outlook 2007 has came back to work!

    Hope this helps anybody else if the post doesn’t.

  2. Well done Leonardo, glad you got it sorted. I’m sure your suggestions will help someone else out there too. There seems to be a number of things which can cause this hang. Hopefully we can catch them all.

  3. Thanks Paulie, that worked. My calendar is no longer freezing when I try to open it. I deleted some open tasks in the task file as you recommended.

  4. Excellent post, in my case it was the tasks that were the issue. Changing the view to “by category” and then marking them as “complete” sorted everything out and I could access the calendar again.

    The only thing I had to do differently was right click on the “arrange by” tab to change the view as when I did not get the full list of options below the current view pane.

    Many thanks!

  5. Thanks Paulie.
    In my case the problem was To Do tasks. So i followed your steps:
    1.- outlook /resettodobar /cleanprofile /cleanviews /cleandmrecords /cleanfreebusy
    2.- change the view to By Category
    3.- mark as completed most of To Do tasks


  6. It took me a week of searching the internet to find this page. It worked great. The good news is during the week I found out about Outlook Tools 2.3 which help me clean up some other issues.

  7. A big thank you for your article on “Outlook 2007 calendar crashes” etc. I took your advice and looked at Tasks and there was the problem. I can now open calendar. Again many thanks.

  8. This really solved the problem. Continuously refreshing tasks were the curlprit. Many thanks

  9. Sometimes, corrupt Outlook profile is a major cause of crash in Outlook 2007 calendar items. It can be solved through ScanPST.exe but it doesn’t ensure successful recovery of the data. In such cases, you can try professional software like Stellar Outlook PST repair, which is also compatible with Outlook 2016 on Windows 10 platform.

  10. Thank you for the tip. Deleting old tasks fixed the problem. I’d pruned old E-Mails from a pst-file, but some tasks were left which referred to deleted items.

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