Exchange 2007 - change DL-Group from non-universal to universal

Right click on the distribution group - select convert

I had to add a user that was on my Exchange server in Sydney to this group in LHR. So what I had to do was I added the user as a contact in Exchange "Contacts" and in the Active Directory "dsa.msc" as a contact - then added him to this distribution group.

A very good test before sending test message is to open an email - add the new distribution list to the email - open to see all members of the distribution group and check the very last added user to see whether you can see that users email address information.