Why does my outlook calendar become unresponsive when I unclick it so I am able to see only the calendar I want to?

Question

Why does my outlook calendar become unresponsive when I unclick it so I am able to see only the calendar I want to?

Ellie McClure 15

In my Outlook calendar I own many calendars, plus I have a group calendar from a SharePoint site. I will often overlay multiple calendars, including my group calendar. However, when I go to the left column, to take remove/unclick calendars, all of my calendars, the ones I own, go away - but not the group calendar. When I click on the box, in the left column, to remove the group calendar; Outlook freezes and becomes unresponsive. Often, never unfreezing until I close/restart the program. Sometimes when it restarts the calendar has removed itself and other times the calendar repopulates and if I try to remove it, it just keeps doing the same thing. (becomes unresponsive, I re-load it and try again, becomes unresponsive etc. etc.). Eventually, I just give up and do my best to complete what I was doing with the hinderance of an extra calendar. I do not know how to make this glitch go away.

SokiGuo-MSFT 31,536 Reputation points Microsoft External Staff

2023-12-12T06:56:14.8+00:00

Hi @Ellie McClure

Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back. If you think my reply is helpful to you, please remember to mark it as an answer. Warm thanks.
Martin Westein 5 Reputation points

2025-05-06T13:54:29.3233333+00:00

In our company there is 1 user who has the same problem. There is a shared calendar that he cannot close without freezing Outlook. When the box is unchecked, the calendar contents disappear, the space stays occupied and a few seconds later outlook is frozen.

Same thing happens if he tries to close his own calendar. I cannot replicate the issue.

Are there any new developments / things I can try?

2 answers

Your answer

SokiGuo-MSFT 31,536 Reputation points Microsoft External Staff

2023-12-12T06:56:14.8+00:00

Hi @Ellie McClure

Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back. If you think my reply is helpful to you, please remember to mark it as an answer. Warm thanks.
Martin Westein 5 Reputation points

2025-05-06T13:54:29.3233333+00:00

In our company there is 1 user who has the same problem. There is a shared calendar that he cannot close without freezing Outlook. When the box is unchecked, the calendar contents disappear, the space stays occupied and a few seconds later outlook is frozen.

Same thing happens if he tries to close his own calendar. I cannot replicate the issue.

Are there any new developments / things I can try?

Answer 1

Martin Westein 5

Just tried something that seemed to help, at least in the case of my colleague:

WIN + R and type %localappdata%\Microsoft\Outlook (outlook cache folder)
To be sure, create a backupfolder and copy all other folders to the backup folder.
After a restart of Outlook we could close / hide the shared mailbox.

Hope this helps someone else.

Mark Davis 0 Reputation points

2025-05-12T05:18:23.94+00:00

Hi Martin, I found that there were two <ProfileName>.nst files, one of which had a (2) in the name as Windows does when a file name is duplicated. I closed outlook, and deleted this file. When outlook restarted, it recreated file (2), but the problem was gone.

Answer 2

SokiGuo-MSFT 31,536 Microsoft External Staff

Hi @Ellie McClure

Welcome to our forum!

For better research, please provide more details about this case:

What is your account type (POP/IMAP/Exchange)?

What is your version of Outlook client? Make sure to update to the latest version.

Will it freeze only when you open the calendar?

Is there the same issue with Outlook web? If the web is working properly, it means that this could be a client issue.

There are many reasons for this issue, here are a few possible workarounds to try:

Make sure you have a stable network connection and make sure that Outlook is not being used by other processes.
Please open Outlook in safe mode and check if the calendar will freeze when opening Outlook in safe mode (microsoft.com). If the calendar is working fine in safe mode, follow the steps mentioned in the article to disable the add-in to identify the add-on that is causing the issue.
Delete and re-create the Outlook profile or the user profile.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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SokiGuo-MSFT 31,536 Reputation points Microsoft External Staff

2023-12-20T06:41:47.5366667+00:00

Hi @Ellie McClure

Haven't received your message for a long time. I am checking the status of this case. Please let us know if you would like further assistance. Meanwhile, if the reply is helpful to you, please try to mark it as an answer, it will help others who encounter the same issue and read this thread. Thank you for your understanding and patience!
J.Brashby 15 Reputation points

2024-10-18T13:11:40.7266667+00:00

Hello,

I am having the same issue. When I run Outlook in Safe mode, it still becomes unresponsive when I uncheck the box to remove a calendar. Any advice? Thanks!
Gold Star User 0 Reputation points

2025-01-21T16:28:21.05+00:00

I am getting the same issue consistently. Unselect the group calendar and it crashes.

I tried rebooting, restarting, but to no avail.
Gold Star User 0 Reputation points

2025-01-21T16:29:51.1066667+00:00

Problem still exists using the 'safe' switch
Rose S 0 Reputation points

2025-05-19T13:38:02.19+00:00

I also have this issue where if I uncheck the left side panel checkbox for another calendar outlook freezes, but if I close the calendar with the upper right x it will close successfully and outlook remains usable. No issues when opening the additional calendar only when closing.

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Why does my outlook calendar become unresponsive when I unclick it so I am able to see only the calendar I want to?

2 answers

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