List of available rooms not shownig in Outlook 2010

All our users use the Room Finder feature in Outlook 2010 (Exchange 2010). Since last Thursday (19.11.2015) the room finder dropdown list disappear for users usinf on of our 3 Exchange CAS. It happened after they downloaded updated GAL.

If we delete user profile, it is OK. However, deleting of user profile is not a solution for us because we are talking about more than 3000 users. Also as we use cache mode, we don't want to replicate again entire mailboxes. And at last we don't want to loose settings and documents other than Outlook.

We suspect that there is some cache or something, but we don't know where to look.
Ondřej Doležalsystem eng.Asked:
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Joe PriorCommented:
Check out the thread:

Let me know if the resolution of this thread helps you in resolving the issue
Ondřej Doležalsystem eng.Author Commented:
Thanks for the link. However, we are on Exchange 2010 SP3 already.

Strange is that the problem is present only for users connected to one of our 3 Exchange CAS.
Joe PriorCommented:
Try to Rebuild the GAL and download it to Outlook
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Naushad shaikhIT Consultant - Messaging SupportCommented:
is this problem same in outlook online mode for user?
Ondřej Doležalsystem eng.Author Commented:
Yes, the problem is the same even if we disable cache mode in Outlook.

We tried to switch on the verbose logging of Outlook. I attached some logs.

Strange is that Outlook doesn't receive anything on its request for room lists (log 20151123-143758937-AS.log in attachment).
Ondřej Doležalsystem eng.Author Commented:
@Joe: We already tried the update GAL. We event. created a new one (with distribution via webservice only - no public folders). The situation is the same.
Ondřej Doležalsystem eng.Author Commented:
Finally it started to work for us.

Our Exchange admin told me that he rebuild the GAL, but it was not really the case. He just rebuild the Offline Address Book.

So last night we did following:
- we restarted Exchange CAS
- we created a new GAL (not possible to rebuild)
- we removed the previous GAL (created and migrated from Exchange 2003)

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Ondřej Doležalsystem eng.Author Commented:
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