When you have a lot of conference rooms, equipment or special rooms mailboxes it is hard to list or find available free rooms during a particular time slot. Luckily, Office365 and Outlook 2013/2016 have a special feature called ‘Room Lists’, which enable you to find and schedule  a room quickly based on availability and offer suggestions during room reservation.

In simple terms Room List work  as distribution groups for conference or other types of rooms.

Use PowerShell to login to Office365:

Create a room list:

Add rooms to a list:

Check what Room Lists you have:

Check what conference rooms are part of a particular room list: