I ran across a tough one. We're running Exchange 2013 without Cached Exchange Mode.

The "All Rooms" address list has the following recipient filter: ((RecipientType -eq 'UserMailbox' -and SamAccountName -like 'confroom*') -and ResourceSearchProperties -ne $null)

If I create a room in DB1 with the wrong name, for example "xconfroom1", it won't show up in the room list. If I rename it to "confroom1" to conform with the filter, it shows up in the room list. This is working expected.

However, if I create "xconfroom1" in DB3 and rename it to "confroom1", it does NOT show up in the room list in Outlook, even though it DOES show up in the Exchange address list preview. But if I move the newly renamed "confroom1" from DB3 to DB1, it shows up in the Outlook room list. If I move it once again back to DB3, it continues to show up in the Outlook room list. 

Any ideas as to why renamed rooms in DB3 aren't showing up in the room list, even though they meet the recipient filter criteria? (I verified the SAM/Resource attributes in ADSI after renaming, and everything looked as expected at each step.)

Any help would be appreciated!

Hi WWood,

Base on my knowledge, it may be due to the address list information is not synchronized in time.

You can try to update the address list and check the result.

Update-addresslist "All Rooms"

Best regards,

That pulled the renamed mailbox into the room list. I'd love to know why it's a problem in one database and not another, but the workaround is good enough. :) Thanks!