Mail Universal Groups vs Mail Non-Universal Groups

nmigjesus
nmigjesus used Ask the Experts™
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I need you help in some questions.
I have 2 domains in 2 cross forest and have one stucture of Exchange 2K3, and Exchange 2K7 in another.
In Exchange 2K7 I have migrating every account and groups. The groups still are in Global Distribution (Mail Non-Universal Group).
Before I begin migration of another domain, I want to know if i should change the type of Distribution Groups to Universal, because i have users and local groups from AD of Exchange 2K7 that need to add in Distribution Groups of domain of Exchange 2K3.
I want too know de positives and negatives things about Mail Non-Universal Group and Mail Universal Group.
Thanks a lot.
BR,
Nuno Jesus
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In short, it would be best for them to be universal groups. If they're not then you can get into all sort of trouble - mainly that distribution lists from one domain cannot bet expanded by user in the other domain, etc.
One caveat: you need to make sure that your (active directory) domain- and forrest functional levels are (at least) 2003.

Commented:
Once migrated non-universal groups will work fine, you simply need to modify them in active directory rather than in the Exchange management console. When right clicking on them you will have a choice to convert them if you like. Converting them will allow you to manage them in exchange.

For a run down of the difference between the two see:

https://technet.microsoft.com/en-us/library/bb125256%28EXCHG.80%29.aspx
Michael B. SmithManaging Consultant

Commented:
Sorry, I changed blogging platforms a couple of years ago. The above link is dead. This is a working link and the current recommended solution: https://www.essential.exchange/2010/09/30/changing-security-groups-to-distribution-groups/

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