The end user's Microsoft Outlook window turns white, and the application becomesunresponsive.
This issue can be caused by the following:
- An unsupported username character limit in the .Net Framework.
- 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.
- Reduce the username length to 19 characters and below.
- Update the SQL user password and ensure that it is set to not expire.