Distribution group

I have to change the description of conference room and change capacity to 15

Where should I do  as we have on premise active directory and it is synced through and sync to office 365

So can I do in office 365 or on premise

Where do I change capacity
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Vasil Michev (MVP)Commented:
Well where is the room mailbox currently residing, and where was it created? If it was moved from on-premises, you need to make the changes in AD. If it was created directly in O365, make the changes via the O365 tools.
pramod1Author Commented:
thank you sir, I will change in on premise , don't know where to change the capacity
Vasil Michev (MVP)Commented:

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