We have several users who are away for long periods of time (sometimes up to a year), and we disable their AD account when they leave. This causes a problem, because the users might be in one or several security groups that are mail-enabled in Exchange 2010 (Distribution Groups).
Is it possible to hide the users from the Distribution Groups when the account is disabled?
NOTE: Not every user have an Exchange account, so the "Hide from global address list" isn't applicable.
The only thing I can think of is to remove the user accounts in question from the groups.
Personally, this is why I only use security groups to grant access to resources and distribution groups for email.