Hi,
we are seeing the following behaviour in our exchange 2013 environment.
With outlook 2010 clients the room finder works fine and you can see all the room distribution lists.
In outlook 2013 the room distribution list dropdown is not present
We can select the rooms via the rooms button, the rooms distribution lists can be added as a required attendee and freebusy information for the list is shown in the scheduling assistant.
If you expand the distribution list you see free/busy information for ALL rooms fine.
The issue occurs either in cached mode or online.
OWA works as expected and outlook 2010 also works as expected.
Tearing my hair out here :)
Thanks
Shawn