Why is my Microsoft Exchange Server Unavailable?

Fix – The connection to Microsoft Exchange is unavailable

  1. Edit your registry The connection to Microsoft Exchange is unavailable error usually appears due to problems with your registry. Your registry holds the necessary information that Outlook uses in order to access Microsoft Exchange, and if this information doesn’t exist in your registry, you’ll get The connection to Microsoft Exchange is unavailable error message. To fix this problem, you need to manually add the required data to the registry. Editing registry can be somewhat dangerous and cause certain issues if you don’t do it properly, therefore use caution and create a backup of your registry just in case. Users reported that they fixed this problem by copying the registry key from a working PC and adding it to their registry on the problematic PC. To do that, follow these steps: After adding this key to your registry, the problem with Microsoft Exchange should be fixed completely.

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  1. Update your Outlook profile According to users, this error occurs if you use Microsoft Outlook without certain encryption settings. To fix this problem, you just need to update your Outlook profile by following these steps: After making these changes the issue with Microsoft Exchange should be fixed.
  2. Create a new Outlook profile Users reported that you can fix The connection to Microsoft Exchange is unavailable error simply by creating a new Outlook profile. To do that, you need to follow these simple steps: After creating a new profile, set it as default and check if the error is resolved.
  3. Delete your Outlook profile Few users suggest that in order to fix this problem you need to delete your Outlook profile and recreate it. To do that, simply go to Control Panel > Mail and delete your default profile. After deleting the default profile, start Outlook and you’ll be asked to create a new profile. After creating a new profile everything should work without any problems.

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  1. Use flushdns command One way to fix The connection to Microsoft Exchange is unavailable error is to run flushdns command. This is a simple procedure, and to perform it you need to follow these steps:
  2. Restart Microsoft Exchange services According to users, one way to fix this problem is to restart Microsoft Exchange services. To do that, follow these steps: After Microsoft Exchange service restarts, check if the problem is resolved.
  3. Disable your antivirus Using antivirus is crucial for your system’s safety, but sometimes your antivirus software can interfere with Outlook and cause this error to appear. To fix this problem, you need to disable your antivirus and add Outlook and the necessary applications and ports to the list of exclusions. If that doesn’t help, you might want to temporarily remove your antivirus program. Users reported that Malwarebytes was causing this error to appear, but keep in mind that almost any third-party antivirus software can interfere with Outlook and cause this issue.
  4. Set the WINS IP addresses on your PC If you’re using a VPN while connecting to the server, you need to set your IP addresses to static. According to users, changing the WINS IP addresses fixes the problem with Microsoft Exchange, therefore be sure to try it if you’re using a VPN.

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Fix – The connection to Microsoft Exchange is unavailable Outlook 2007

  1. Enable RPC encryption in Group Policy Editor If you’re using Outlook 2007, you’ll need to download the latest version of Outlk12.adm Group Policy template and add it to your domain controller. After adding this template, follow these steps: SPONSORED
  2. Export registry keys from a different PC You can fix this problem simply by exporting registry keys from another PC that runs Outlook 2007. To do that, switch to a different PC and follow these steps: After adding this file to your registry, the problem with Outlook 2007 and Microsoft Exchange should be fixed completely.
  3. Remove ZeroConfigExchange DWORD from the registry According to Microsoft, ZeroConfigExchange DWORD can cause this problem with Outlook 2007, but you can fix The connection to Microsoft Exchange is unavailable error simply by removing the problematic DWORD. To do that, follow these steps:

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  1. Create a new DWORD You can fix the problem with Microsoft Exchange and Outlook 2007 simply by creating one DWORD in your registry. This is a simple procedure, and you can do it by following these steps: After that, close Registry Editor and check if the problem is resolved.

Fix – The connection to Microsoft Exchange is unavailable Outlook 2010

  1. Enable RPC encryption Before you start applying this solution you need to download the latest version of the Outlk14.adm Group Policy template and add it to your domain controller. After doing that, you need to follow these steps:
  2. Add proxy exceptions Your proxy settings can interfere with Microsoft Exchange and cause this error to appear while starting Outlook 2010. To fix this problem, you need to go to the Internet Options and add your mail server to the Exceptions list. To do that, follow these steps: After adding the mail server to the exceptions list, the problem with Microsoft Exchange and Outlook 2010 should be completely fixed. Solution 3 – Add DefConnectOpts DWORD to the registry This solution is quite similar to the one that we used to fix the problem with Microsoft Exchange and Outlook 2007, therefore we’ll keep this one as short as possible. To fix this problem, start Registry Editor and go to the HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0OutlookRPC key. In RPC key create a new DWORD and name it DefConnectOpts. Open its properties and set the Value data to 0. Click OK to save changes and check if the problem is resolved.

READ ALSO: Fix: Outlook folders in your mailbox have name conflicts

Fix – The connection to Microsoft Exchange is unavailable Outlook 2013

  1. Enable RPC encryption If you’re getting The connection to Microsoft Exchange is unavailable error, you should be able to fix it by enabling RPC encryption for Outlook 2013. To do that, first, download Office 2013 ADM templates and add them to your domain controller. After that, follow these steps:
  2. Edit your registry Users reported that this issue occurs if the computer can’t find the mail server via Active Directory. You can fix this problem by making a couple of changes in your registry, but before making any changes to your registry, we advise that you back it up. To fix this problem using Registry Editor, do the following: After changing your registry and creating a new profile in Outlook, the issue with Microsoft Exchange should be fixed.
  3. Download and run Microsoft Office 365 Support & Recovery Assistant If you’re getting The connection to Microsoft Exchange is unavailable error while using Outlook 2013, you might be able to fix this problem by downloading Microsoft Office 356 Support & Recovery Assistant tool. After downloading this tool, run it and let it fix any potential problems. Few users reported that this tool fixed the Microsoft Exchange error message on their PC, so you might want to give it a try. The connection to Microsoft Exchange is unavailable error will prevent you from sending or receiving any emails, but you should be able to fix this problem using one of our solutions. READ ALSO:

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