Answer / muthiah nagarajan

A query-based distribution group provides the same
functionality as a standard distribution group.

However, instead of specifying static user memberships, you
can use an LDAP query (for example, "All full-time
employees in my company") to dynamically build membership
in a query-based distribution group.

This reduces administrative costs because of the dynamic
nature of the distribution group. However, query-based
distribution groups have a higher performance cost for
queries whose outcome produces many results.

This cost is in terms of server resources, such as high CPU
usage and increased memory usage. This increased usage
occurs because every time an e-mail message is sent to a
query-based distribution group, an LDAP query is executed
against Active Directory to determine its membership.

Answer / 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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