The short answer is that you can't change the behavior. The underlying GNU/Linux platform is case sensitive. I believe some of the products, such as CCX, may have enhancement requests to emulate the Microsoft behavior of case insensitive usernames. I wasn't able to find any of these offhand though. If no one else chimes in with specific caveat IDs or alternative options I suggest filing a feature request with your Cisco AM/SE to make your voice heard.
Please remember to rate helpful responses and identify helpful or correct answers.
