exchange Server Error "The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action."
Problem: exchange Server Error "The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action." Solution: Method 1: 1.Go to Administration Tools and open the "Services" tool. (You could also enter services.msc in the search box and press enter.) 2. Find the Exchange Address Book service and start it. 3. You can configure it to start automatically if you want. Method 2: By Deleting Reg Key from client computer: Remove the Group Policy or the system policy that sets the following registry entry: HKEY_CURRENT_USER\Software\Policies\MicrosoftOffice12\14\OutlookAutoDiscover Note: Take the registy back up before deleting any key.