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Outlook cannot log on. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

Issue: Unable to configure Outlook profile in Outlook 2010 externally.

Error: Outlook cannot log on. Verify you are connected to the network and are using the proper server and mailbox name. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

Problem Statement:
Recently I have faced strange issue where user unable to configure Outlook externally. However Exchange 2010 is properly configured and worked fine internally.
Whenever we configured using outlook anywhere, sometimes it prompt for credential however credential never except.
Check Exchange 2010 server all settings, including outlook anywhere, autodiscover, permission etc.
Finally I found solution.
Resolution was very simple,
In order to resolve the issue,
1.       Log on to Exchange 2010 Server.

2.       Open Services (Run> services.msc)

3.       Make sure the "Microsoft Exchange Address Book" Service was running on each Exchange server.

4.       If service is already running then just restart the "Microsoft Exchange Address Book" Service.

5.       As soon you started that service, all users will be able to successfully connect to Exchange 2010 through Outlook 2010.

Thank you.



  1. Thank you! I was going crazy as I couldn't setup Outlook via RPC over HTTPs or locally. Rebooted Exchange last night and the one service that didn't start....address book service. Once it was started everything was right as rain.

  2. Very helpful information. Thank you for sharing!

  3. Honestly, this really helped me! I was looking at RPC all over but no luck! But this one fixed it.

  4. After several hours of pulling hair, this was found and WORKED!!

  5. This fixed the problem. Thank you


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