Is it possible to change Auto response for restricted room mailbox. I am trying to change auto response from “you don’t have permission to book this meeting room ” to please contact so on so person but I am unable to do ..Please help me on this

Hi! Is there a way to do it on Office 365 Exchange Online?

Yeah Exchange will only work with universal groups.

Sounds like you fall into a multi-forest hybrid scenario, but you haven’t quite gone all the way with it. If you’re synchronizing users from both forests, but one of them doesn’t have Exchange installed, then you’re getting into unsupported territory as well (the requirement to have an on-prem Exchange server to manage Exchange attributes for synced objects).

Here’s Microsoft’s doco on multi-forest hybrid. This is getting outside of my experience area, but my thinking is that you will need to set up the multi-forest hybrid properly to get everything working.

https://technet.microsoft.com/en-us/library/jj873754(v=exchg.150).aspx

So the users can see the meeting rooms in their Outlook Calendar and can see the free/busy data for each room. They can also see the rooms in the GAL and in the room lists. If they try and right click and select “New Meeting Request” or “New Appointment” its greyed out. If they try to create a new appointment and include one of the rooms as a resource, the meeting gets automatically declined with a message saying “Your meeting request was declined. You don’t have permission to book this resource.”

This doesn’t happen for the users in the non-Office 365 domain (ForestA) as they are members of the Universal Security group controlling access to these rooms. Because the groups are Universal security groups the users from the trusted forest (ForestB) cannot be included in the group and Exchange cannot see any groups created in ForestB as there is no on-premise Exchange environment there.

I have tried creating domain local groups, which allow me to add the users from ForestB but then Exchange won’t see them for me to add them to the rooms.

What does “unable to book the rooms” mean though? They can’t see the rooms in the address list? They don’t appear in the room picker? Their meeting request gets rejected?

What are you trying to give them? The ability to book meetings?

So we have a Exchange 2010 environment in our company, we also have a Office 365 environment. The Exchange 2010 is installed to service our main user forest (ForestA), the Office 365 environment is for a new forest (ForestB) setup for acquisitions. There are trusts in place. The Exchange 2010 Organisation has no presence in forestB so there are nor servers etc. We have AADConnect syncing our users and groups from ForestA and ForestB to Azure/Office365

On our Exchange 2010 environment we have a whole bunch of meeting room mailboxes that we need to give the Office 365 users to. I’m struggling to see how I need to do this.

The mail enabled security groups that are used to control access to the meeting rooms are not being synced as far as I can see.

I’m not sure where to go from here, can anyone help?

@kiran – use powershell script to grant delegated rights on the 75 meeting rooms