Forum Discussion

AlinB17's avatar
AlinB17
Copper Contributor
Apr 10, 2026

Room Mailbox Time Zone change

Hello there, has anybody experienced what the consequences of correcting the time zone configuration of a room mailbox when its already fully booked with appointments (especially re-occuring ones)? ...
RobertSparnaaij's avatar
RobertSparnaaij
MVP
Apr 13, 2026

In general, it shouldn't as these are meetings and not appointments. Also, the meetings aren't created by the Room Mailbox but within the Mailbox Calendar of the organizer. This means that time-zone information is stored within the meeting and thus the "relative time" will remain the same.

So, when an organizer scheduled a meeting at 14:00 CET, it will now show as 12:00 in the Calendar with the Reykjavik time zone. Changing the time zone of the mailbox will then show it correctly as 14:00 CET which is still 12:00 within the Reykjavik time zone.

Also note that the time zone of the Room Mailbox doesn't (always) really matter. When you connect to it with Classic Outlook and your Windows time zone is set as CET, you will see all meetings within the Room Mailbox as CET as well.