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Dynamic distribution groups
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Keeping track of people is generally difficult in large companies, which is why they invest so much money in HR systems. The same challenge exists for messaging administrators and help desk personnel, who can spend a lot of time maintaining the membership of groups as new people join the company, others leave, and others take on new roles and responsibilities. As we have just discussed, populating and maintaining the membership of large distribution groups can be a nuisance for Exchange administrators. 6 Dynamic distribution groups offer a solution to this problem by allowing groups to be based on a query that Exchange can execute against Active Directory to determine the latest membership every time a message is sent to a group. The success and failure of dynamic distribution groups is entirely dependent on the accuracy of the data held in
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Active Directory. A dynamic distribution groups is successful when messages are delivered to the right people all the time, and you can expect success if the properties of mailenabled objects are maintained in a consistent manner. On the other hand, if the data are inconsistent or not maintained you can expect some interesting results when the transport system expands the group to address a message. It s also fair to say that dynamic distribution groups generate a higher load on hub transport servers than normal groups. Instead of reading group membership when a message is routed, the hub transport server has additional processing to execute the query to determine group membership before a message can be routed. Although most queries are simple and execute quickly, especially on the high-powered server technology in use today, it s also possible to create queries that return thousands of recipients such as All users in the United States, which will impose some strain as messages are processed. Even so, it s unlikely these groups will be used more than a few times per day and this should not impose too high a performance penalty on any server. From a user perspective, the only difference between a normal group and a dynamic group is that you cannot view the membership list of a dynamic group by looking at the group properties through the GAL. Dynamic groups don t hold security principals, so they cannot be used to secure objects. Apart from these minor differences, dynamic groups appear very similar to normal groups.
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OPATH queries
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Behind the scenes, every time a hub transport server processes a message addressed to a dynamic distribution group, it uses the query stored in the group s properties to search Active Directory and expand the group membership into a list of addresses that match the query. Queries are stored in OPATH format. Earlier versions used LDAP queries but OPATH is the default query syntax for Windows PowerShell, so Exchange Server 2007 adopted it as the standard. A dynamic distribution group stores its query in the MSExchQueryFilter property, where you ll find something like this:
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((RecipientType eq 'UserMailbox' and Department eq 'Sales') and not (Name like 'SystemMailbox{*'))
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This query looks for all mailboxes that have Sales as the value in their Department property. The last part of the query excludes system mailboxes. It is obvious that this query will only work if the value of the Department property is maintained. The query won t find mailboxes that belong to the department if the value is left blank or not spelled correctly. In other words, don t expect dynamic distribution lists to be able to understand what Active Directory should contact. These queries operate on precise data.
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6 Managing Mail-Enabled Recipients
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Tip
Queries used for dynamic distribution groups are scoped to establish what Active Directory objects should be included when the query is evaluated . The scope is stored in the RecipientContainer property for the query . It s important to establish the correct scope because this has a dramatic effect on the objects that the query returns and, therefore, on who will receive messages addressed to the group . If the scope is set incorrectly, you might end up with no objects being found, meaning that a message will not reach any recipients . On the other hand, if the scope is set too broadly, a message could be delivered to tens of thousands of mailboxes when you really intended it to go to just a few .
If you re moving from Exchange Server 2003, you might have some of the older LDAPbased query-based distribution groups. You can upgrade these groups to become dynamic distribution groups with the Set-DynamicDistributionGroup cmdlet by specifying the ForceUpgrade parameter. This will upgrade the version of the group and make it manageable by Exchange 2010 and translate the old LDAP query into OPATH format. Both LDAP and OPATH format queries are kept in the group properties to ensure backward compatibility and to ensure that the query is understood by Exchange 2003 transport servers. For example:
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