We are in the midst of migrating our mail services to Exchange Online (Office 365), and have a hybrid configuration in place and generally working. Sometime in the past few days the drop-down menu showing room lists stopped appearing in the Room Finder in Outlook (both 2010 and 2013). I don't know if recent configuration tweaks -- we just resolved a problem with Exchange Online being able to retrieve free/busy details from on-premises mailboxes -- caused this, or if it's unrelated to our migration effort. This feature was working until recently, and we haven't changed the properties of the room mailboxes or the room lists (distro groups). How can I go about troubleshooting this? Web searches have yielded little advice.
IT Operations Manager
Strata Decision Technology