Question : Is there a quick way to change all Active Directory user aliases to lower case?

We have not been consistent when adding new accounts' "user logon name."  Sometimes they are entered in all lower case letters, and sometimes a capital letter is used for the first letter of the last and first names.  It didn't seem to matter because logon names are not case sensitive when used for logging on.  We are now trying to integrate an application with Active Directory, and the application will be pulling aliases from AD.  In this application the logon name is case sensitive.  I've been asked if I can change all user logon names, or aliases, to all lower case for consistency.

Our Active Directory is Windows 2003 Native Mode.  We have both Windows 2003 Sp2 and Windows 2008-R2 domain controllers in our domain.  We have just one forest with one domain in it.

I'm not experienced with scripting, but I imagine a script will be required.  I would really appreciate it if any scripting suggestions could be explained for a scripting novice.

Thanks in advance for any assistance with this!

Answer : Is there a quick way to change all Active Directory user aliases to lower case?

i would be looking at the spam/virus filter (which i'm guessing is either an appliance or another server)
if you can get the messages to queue there while you resolve the issue, then the messages must be getting thru your firewall

i would review the receive connectors on the exchange server ensuring that your spam/virus filter can access (anonymous and ip address)
can you perform a test telnet session from the spam to exhcange on port 25