hello , we are running exchange 2007 sp1 RU 5, in a single wondows 2003 domain, I know that exchange 2007 dont want us to create mail enabled global groups due to multi domain global catalouge issue, but why I cannot create mail enabled global groups in single domain ? is there any other reason for that?thanks.

No, there is no other reason. In a forest whichis made upof a single domain, you would be fine with either domain local or global groups. But as soon as you extend this forest to comprise more than one domain, you'll have problems with anything else than universal distribution groups.With privious versions of Exchange, you could use global groups (and the issues would soon pop up). If you co-exist with or upgrade from a Exchange 2000/2003 orgainization, you can still use but not easily administer global distribution groups.jas

In Exchange2007, you can create or mail-enable only universal distribution groups. You may have mail-enabled groups that were migrated from previous versions of Exchangethat are not universal groups. For details, Managing Distribution Groupshttp://technet.microsoft.com/en-us/library/bb125256.aspxFrank Wang

In Exchange2007, you can create or mail-enable only universal distribution groups. You may have mail-enabled groups that were migrated from previous versions of Exchangethat are not universal groups. For details, Managing Distribution Groupshttp://technet.microsoft.com/en-us/library/bb125256.aspx Frank Wang Thanks for replies,Frank, I have read the technet link and other information available on exchange team blog, and my migrated groups from Exchange 2003 are working fine, I can still create universal groups, mailenable them and turn them back to global, I am doing this because I have to nest these groups into other global groups.So I am looking for as to why I cannot just create mail enabled global group since I am in single domain and no plans of going multi domain at all.Argument i have from my manager is that universal group membership will also be replicated accross all DC's we have 150 DCs, and we do not want to increase replication traffic due to universal groups.

Hi,I know you want, but exchange 2007 can only mail enable the universal groups, by design.If you still want to use mail-enabled global group, you have to changetheuniversal group tothe globle one manually.You can find more information,http://www.pro-exchange.eu/modules.php?name=News&file=print&sid=299Frank Wang

thanks Frank, so we have to live with univsersal group membership being replicated accross all Dc's