Answer Posted / rizwan

A query-based distribution group is a new additional type
of distribution group in Exchange 2003. This new type of
distribution group provides the same functionality as a
standard distribution group; however, instead of specifying
static user memberships, a query-based distribution group
allows you to use an LDAP query to dynamically build
membership in the distribution group (for example All
employees with a special group membership). Using query-
based distribution groups we can reduce the administration
costs dramatically. However a Query-based Distribution
Group needs more Server resources like CPU power and RAM.

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