Mimecast for Outlook: Microsoft Outlook is Unresponsive

Document created by user.oxriBaJeN4 Employee on Sep 4, 2015Last modified by user.oxriBaJeN4 Employee on Oct 25, 2016
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The end user's Microsoft Outlook window turns white, and the application becomesunresponsive.




This issue can be caused by the following:

  1. An unsupported username character limit in the .Net Framework.
  2. For multi-user environments, authentication may be failing on the SQL server. This is most likely due to SQL password expiration for the Mimecast account.




  1. Reduce the username length to 19 characters and below.
  2. Update the SQL user password and ensure that it is set to not expire.