Why Microsoft Outlook Stops Responding or Not Working? Let’s have a look at the list of reasons or causes for why MS Outlook Not Responding. According to Microsoft, these problems occur due to one or more of the afterward reasons. In this article, we will consider the causes and solutions to resolve these issues. Sometimes it is extremely frustrating for some users and can also affect organizations enormously. Therefore read it till the end to know the best effective solutions to fix this Outlook error. If your Outlook freezes or hangs, at some point while using it and showing up error messages like Microsoft Outlook stops responding, Outlook stuck at processing, Outlook not responding, or Outlook stops working” then this post is for you.