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StephenCodrington-6691 asked JadeLiang-MSFT commented

Outlook could not read the calendar

This week I have been getting an error message every time I switch between calendar or contacts back to email. The solutions to run outlook / safe just get another error message 'the command line argument is not valid. Verify the switch you are using'. The panel on the email page shows a calendar for one month but no appointments. I have checked and downloaded updates but no change. I have Outlook 2103 using 365

windows-10-generaloffice-outlook-itpro
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You mean it works without a problem when you run it in the Outlook safe mode , is that correct?
If yes, then an extension would cause this issue and you have to disable or remove it.

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I can't open the safe mode: 'the command line argument is not valid. Verify the switch you are using'

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JadeLiang-MSFT avatar image
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JadeLiang-MSFT answered StephenCodrington-6691 commented

Hi @StephenCodrington-6691,

This week I have been getting an error message every time I switch between calendar or contacts back to email

What's the specific error that you are facing with when you switch the view? In order to further analyze your issue, pelease provide us with a screenshot of your error(Notice: Please hide your personal information in the screenshot for security.)

The solutions to run outlook / safe just get another error message 'the command line argument is not valid Verify the switch you are using'

I noticed the command that you post "outlook / safe" seems to has an extra space before "safe", which may cause the error above. If you think the safe mode could work for your issue, please try to re-type this command "outlook.exe /safe" or press "ctrl" and double-click the outlook shortcut on the desktop to restart your outlook in safe mode for testing.

If it could work normally in safe mode, the issue may be related to your add-ins, it's suggested to disable your add-ins gradually to check which causes it(File>Options>Add-ins>COM add-ins, Go>uncheck the add-in to disable it)

The panel on the email page shows a calendar for one month but no appointments

Did you mean this calendar in your email page? If so, it actually could only display the events in this week in your default calendar.
88966-snipaste-2021-04-19-14-10-28.jpg

If your issue has any update, please feel free to post back.


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Thanks. It opened OK in safe mode & I didn't get the error message. However, I have disabled all the add-ins and still get the error message whenever I switch between email, contacts, calendar

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And the Repair function hasn't solved it either

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JadeLiang-MSFT avatar image JadeLiang-MSFT StephenCodrington-6691 ·

Hi @StephenCodrington-6691,
Thanks for your update. Have you set any customized setting in your Outlook?
As I know, there're also many customized settings that were disabled in safe mode : such as customized toolbars, Navigation Pane and Ribbon, it's suggested to reset your customized view settings via command "Outlook.exe /cleanviews" to check.
If that's still invalid, we could also try to reset the Ribbon in Outlook for testing (File>Options>Customize Ribbon>Reset>Reset all customizations)

89498-snipaste-2021-04-20-18-46-35.jpg

If your issue has any update, please feel free to post back.

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Reza-Ameri avatar image
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Reza-Ameri answered
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StephenCodrington-6691 avatar image
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StephenCodrington-6691 answered JadeLiang-MSFT commented

When I switched on my pc this morning the error had disappeared - I don't know if that had anything to do with disabling add-ons or an overnight update, but it's working properly now.
Thanks for your help

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Hi @StephenCodrington-6691,
Thanks for your update and glad to see your issue has been resolved. In order to close this thread normally, would you mind marking the helpful post or your own post to an answer?Thanks for your understanding.

Have a nice day :)

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