If you are getting the following error when Outlook is downloading the Offline Address Book.
Microsoft Exchange offline address book
Here are some steps you need to check
– Make sure your Global Catalog server is working properly
– Make sure your Exchange server can see the GC domain controller
– Make sure you public folders are working correctly
If the Global Address Book is blank or empty when you start Outlook, check which Global Catalog the address is getting from. This will give you a good direction of which DC is the problem.