title: Are Microsoft SQL Server DB userIDs case sensitive?
body: <p>I'm logging in to a server through RDC and there we have an SQL Server instance.
  I think SSO is activated here.</p>
  
  <p>I connect to SQL Server Managenment Studio (SSMS) with windows authentication, I'm not able to connect to the database. (SSMS shows the logged in UserID is in UPPERCASE)</p>
  
  <p>When I connect to SSMS by 'Run as different user' and put the same credentials I used to log in to this server (i.e. Windows credentials only), I can connect to the Database then! (SSMS shows the logged in UserID is in lowercase).</p>
  
  <p>Can someone help why this is happening!? and what can be one to resolve it?</p>