This is a request that customers often ask me: how to create a distribution group in exchange based on a security group as, very often, there is the need to send mail to a group of users who hold the same role and that probably, for organization and for managing access to the file server, They are already grouped in a security group; two simple steps:
1) Transforming the AD security group in Universal (from the group properties)
2) Launch from exchange powershell the command: Enable-DistributionGroup “GroupName”
N.B.
Pay attention that the universal group can not be a member of a global group so you have to check that there are no dependencies of this kind in the tab “Member of” of the group you are editing. In any case, if you try to change the scope of the group but it is not possible an error will pop up.