Moving an appointment in Exchange 2016 owa calendar changes Time Zone

Rob van Houten 6 Reputation points
2021-10-19T09:04:22.1+00:00

L.S.,

A couple of our users complained that some of the recepients of the appointments they made in teams received them with a time that was two hours off. After extensive testing, I did find a problem, which I have been unable to fix.
All ics files which are send have a TZID:W. Europe Standard Time, which the external recipients have no problem with, but if they move the appointment in the webmail owa, this changes automatically to UTC. I don't see any option to stop exchange from changing the timezone. If they move an appointment in Outlook or Teams, the timezone stays as Western European Standard Time. Is there any way to keep Exchange from making this change?

With Regards,

Rob van Houten

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Rob van Houten 6 Reputation points
    2021-10-29T11:56:15.377+00:00

    The problem exists, even with the timezones set correctly. I will close it, but the problem hasn't been solved. It is strange that moving an appointment in outlook or webmail creates a different ICS header, which some external mailservers are not capable of handling. So I will warn my users not to use webmail to create or change their appointments.

    1 person found this answer helpful.
  2. Kael Yao-MSFT 37,496 Reputation points Microsoft Vendor
    2021-10-20T06:33:15.85+00:00

    Hi Rob.

    Did you mean if changing the time of an appointment in OWA, it would cause a two hours delay to the actual time.
    If it is the case, since OWA would use the time zone setting of the mailbox, please run this command in Exchange Management Shell to have a check if the time zone of the mailbox is the same as the current zone time of the affected users. 

    Get-mailboxregionalconfiguration -identity <user mailbox>

    If the time zone isn't Western European Standard Time, please run this command to change it and see if it can get rid of this issue: 

    Set-mailboxregionalconfiguration -identity <user mailbox> -timezone "W. Europe Standard Time"

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  3. Rob van Houten 6 Reputation points
    2021-10-25T09:12:46.157+00:00

    That is the timezone which is shown. The problem seems to be that the ics which is send is different depending on whether you change or make it in the owa or Exchange. So i basically have to tell my users to warn the external contacts they have with this problem that the time is two hours off, and put the exact time in the meeting description?