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.NET Framework Error while using Outlook

Mariya Beckham ~ Modified: March 1st, 2016 ~ Tech Query ~ 3 Minutes Reading

Troubleshooting .NET Framework Error While Using Outlook


Working with MS Outlook at times can be interrupted with the occurrence of a number of errors. One such error that arises when a user works is .NET Framework Error. This article deals completely with this error, covering the symptoms, causes and the methods to troubleshoot this error.



Whenever a .NET Framework Error occurs, you will be notified with any of the two error codes. One is 0X0070643 and the other is 0X643. Which of the two is encountered depends on the kind of function that the user was doing at that time.




There are number of reasons due to which this error is encountered. Some of them are:

  • The dominant reason behind the occurrence of this error is the mis-configuration of files.
  • In case you are using MS Forefront Identity Manager Add-in, it will not be supported in Outlook 2007 and you will encounter this error.
  • A corrupted or cluttered registry can also give rise to this error.


Workaround to Troubleshoot the Error

Since there are multiple reasons, due to which the .NET Framework error can arise, there are several workarounds to troubleshoot this error. Some of them are:

  1. Start Outlook In Safe Mode & Disable Add-Ins

The first method that we can try is by disabling the add-ins by opening Outlook in safe mode. Press Windows key and R together. Type Outlook /Safe in the box. Doing so will open Outlook in safe mode. Now the next step is to disable all the add-ins and then enable them one by one to see which add-in is causing the trouble.

Follow the below-mentioned steps to do so:

  • Click on File option and select Options from the drop-down menu.
  • Select the Add-ins option and browse to the option Manage: Com-in Add.
  • Clear the checkboxes if the add-ins are listed there.
  • Exit Outlook.
  • Restart Outlook after sometime.
  • Enable one add-in at a time and see if you are getting the same error. Doing this will help you to understand which add-in is causing the issue.


2. Manually Repair .NET Framework

  • Click Start button.
  • In the search box, type Uninstall.
  • From the menu, select Uninstall a program option.
  • Browse through the list of the installed programs, and select the .NET Framework installed in your system.
  • Right click on it and select the Repair option.
  • Select Next option.
  • Click Finish when you are prompted and then restart your computer.



In the above sections, we have recommended solutions to troubleshoot the .NET Framework error. However, the solution that works for one may be not apt for some other user.