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My Classic Outlook will no longer let me change the time

tony 0 Reputation points
2026-04-07T22:40:24.16+00:00

My Classic Outlook will no longer let me change the time, like setting it 9:10am from 9:00am. When I do this on the "Appointment Tab" and close it it goes back to 9:00am. On the "Scheduling Assistant Tab" it accepts it an then shows the 9:00am on the calendar. When I make an appointment on 1Phone my calendar it accepts that in my Outlook.

Why is this happening?

Thanks,

[PII: Removed]

Move from Microsoft 365 and Office | Other

Outlook | Windows | Classic Outlook for Windows | For home
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  1. Alice-N 8,405 Reputation points Microsoft External Staff Moderator
    2026-04-09T04:08:29.79+00:00

    Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.     

    Hi tony

    Could you please confirm:  

    • Is your Classic Outlook for Windows connected to Exchange/Microsoft 365, or is it POP/IMAP? 
    • Does the time reset happen for new appointments, existing appointments, or both? 
    • Do you have any add-ins enabled (Teams/Zoom/CRM, calendar sync tools, or antivirus email integration)? 

    If you can also share your Outlook version/build (File > Office Account > About Outlook) and whether it behaves the same in Safe Mode, I will be grateful. 

    I would love to hear from you. Have a lovely day! 

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