I'm new to my current employer, being their only Sysadmin. I'm seeing a small handful of users who have User Logon Names which don't conform to the naming convention standard which majority of users are set to. This would be first name and first initial of last name. Some users have first name underscore last name. Needless to say, I'd like to make them conform to the standard.

Before making the change in Active Directory to adhere to the new standard, is there anything I need to be aware of that will help me as I make the change? Is there a good way and a bad way of making this change?

Looking for advice on the best practices when changing a User Logon Name.

Thank you in advance!