Outlook uses Active Directory for recipient name resolution, when online. When Outlook is offline, then name resolution is done using Offline Address Book (OAB).
OAB includes by default only Global Address List:
When selecting “All Rooms”, then this message is displayed:
If you try to avoid this situation, you probably figure out, that you can include other address lists on OAB, shown in the following picture (Organization\Mailbox\Offline Address Book in Exchange Management Console):
After adding other address books, you can download OAB-s using Outlook:
But problem is, that you can have only one OAB active in Outlook. So, if you choose to download “All Rooms”, then you cannot send e-mails to other users or distribution groups. To be specific – you cannot check names, autocomplete works. Automatic download seems to choose random OAB. That’s bad.
I recommend to choose following (default) setting on OAB-s configuration on server side (Organization\Mailbox\Offline Address Book in Exchange Management Console):
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