After users have switched their Outlook to cached mode, they are not longer able to look up a user's AD "logon name" in the "To..." filed of a new email and resolve the user. This works fine when not in cached mode. Yes, ADUC can be used, but this is preferable for some users.
We are using Exchange 2013 CAS and 2010 mailbox servers currently. Is the AD "logon name" not part of the Offline Address Book (OAB)? Is there some way to fix this issue? Thanks.