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This article was previously published under Q328791
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This step-by-step article describes how to configure Exchange 2000 to use predetermined expansion servers to send e-mail messages to some or all of the Microsoft Windows 2000 distribution lists in your company. However, you must consider the factors about expansion server configuration that this article describes and how those factors relate to your company's deployment scenario.
NOTE: For a complete description of Windows 2000 security and distribution groups, see the Exchange Up-to-Date article "The Role of Groups and Access Control Lists in Microsoft Exchange 2000 Server Deployment." To view the Exchange Up-to-Date article "The Role of Groups and Access Control Lists in Microsoft Exchange 2000 Server Deployment," visit the following Microsoft Web site:
http://technet.microsoft.com/en-us/library/cc749909.aspxFor information about how to configure a server running Exchange to act as the expansion server for a particular group, see the "Selecting the Server Used to Expand a Group" section of this article.
Because Windows 2000 groups are similar to Exchange Server 5.5 distribution lists, the Active Directory Connector (ADC) replicates Exchange Server 5.5 distribution lists to the Active Directory directory service as Windows 2000 groups.
NOTE: In this article, the term "group" refers to both Windows 2000 groups that are e-mail enabled and Exchange 5.5 distribution lists. A group represents a collection of recipient objects. A group expedites the distribution of messages and other information to multiple e-mail addresses. When a message is sent to a group that is e-mail enabled, each member of that group receives a copy of the message.
When a user in your organization sends a message to a group, the Exchange computer that acts as the expansion server expands the group to its individual members. This expansion permits members to receive the message. The expansion server also resolves the names of all recipients in the group, and then determines the most efficient message routing.
NOTE: The default expansion server for a Windows 2000 group can be any server in the organization. Any server in the Exchange organization can function as an expansion server.
In this deployment, consider the roles of expansion servers, Exchange Server 5.5 sites, and administrative groups:
NOTE: If your Exchange organization is still in mixed mode, you cannot take advantage of the native-mode expansion server configuration options. You must first set your Exchange organization to native mode.
In this deployment, consider the roles of expansion servers and administrative groups:
If you designate an expansion server, you can minimize message routing in your Exchange organization, which avoids taxing system resources. For example, if your distribution group's members are all on one server, you can designate the server that contains those members as the expansion server. Also avoid designating an expansion server if your distribution groups are not aligned geographically.
Generally, designate an expansion server for a group when:
Remember that the expansion process can be processor-intensive. If your Exchange organization is large and your distribution lists contain many members, a significant burden is placed on the Exchange message transfer agent (MTA) when messages are sent to Windows 2000 groups that are e-mail enabled and to Exchange Server 5.5 distribution lists. Therefore, Microsoft recommends that you isolate one server (perhaps a server that contains few or no user mailboxes) in the site or routing group that is responsible for all group expansion.
To select the expansion server:
For additional information about Exchange in mixed mode and native mode, click the article number below to view the article in the Microsoft Knowledge Base:
270143For additional information about when to change an Exchange organization to native mode, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/270143/EN-US/ )XADM: Mixed Mode vs. Native Mode
(http://support.microsoft.com/kb/281088/EN-US/ )XADM: When to Change an Exchange Organization to Native Mode