Fixing Orphaned Users In All Databases

Max Vernon shows how we can find orphaned users across all databases in an instance and fix them using dynamic SQL:

The next piece of code helps fix orphaned users by reconnecting them to logins that have precisely the same name, but a differing SID. This code is a variant of the above code that dynamically creates ALTER USER statements. A statement is created for each orphaned user where there is a match-by-name in the list of server logins. Once the list of dynamically created ALTER USERstatements are compiled, the commands to fix orphaned users are automatically executed.

Click through for the scripts.