AD Attribute query!

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Hi,

We have a large group, which recently needed major editing, so I handed it
over to another person who asked me a very simple question..

How come when looking at this group, members appeared as one of these types:

FSurname
Firstname Surname

And I had no idea, after a bit of study, it looks like ADUC exposes members
by the Full Name (or Name attribute) of their accounts.

The real question is, how come if they have been created using the normal
Firstname and Lastname options in ADUC, and the full name is generated
automatically from these and is not changed, how do some people have the:

FSurname

I think some of these are old users, so may have been migrated from an NT4
domain, would this cause this?

Also is there any damage (Relating to AD and Exchange etc) of running a
script on these accounts to rename the name attribute to firstname lastname??
.