Hello. We recently migrated from Exchange 2003 to 2010 and had to rebuild the mailboxes for two old users on the 2010 server in order to fix some calendaring and email corruption issues they were having. Since importing them into new 2010 mailboxes, however, internal users who try sending to them have received NDR bounce-backs saying those 2 users are not found. When I looked into it, what I've found so far is that 1) the cached name entries from the old mailbox no longer worked and needed to be deleted in Outlook 2010 and retyped, and 2) if the user is selected from our Global Address List (GAL), the email fails, whereas selecting them from the RECIPIENTS container works. What is recommended to do so that the GAL entry is either fixed re-created? And should the GAL be removed somehow and re-created in 2010? Perhaps this is a legacy GAL and it's causing problems in some cases?
thanks for your help.