Tip

Drawbacks of running a mixed mode Exchange Server environment

Please let others know how useful this tip is via the rating scale at the end of it. Do you have a useful Exchange or Outlook tip, timesaver or workaround to share? Submit it to our tip contest and you could win

    Requires Free Membership to View

a prize.

Exchange 2000 and Exchange 2003 are backward compatible with Exchange 5.5 through the use of the Site Replication Service (SRS). When Microsoft Exchange is running in mixed mode, the Exchange 2000/2003 servers will peacefully co-exist with Exchange 5.5 servers in a common Exchange organization. There are a few issues you need to be aware of though.

Management consoles

Rule number one for mixed mode Exchange Server organizations is that you can't mix management tools. You can't use Exchange Administrator to manage an Exchange 2000/2003 server, and you can't use Exchange System Manager (ESM) to manage an Exchange 5.5 server.

Exchange System Manager will display Exchange 5.5 servers as a part of the Exchange organization. But they will be displayed as read only to prevent administrators from modifying them through ESM. Likewise, the Exchange Administrator console will display both Exchange 5.5 and Exchange 2000/2003 servers.

Unfortunately, the Exchange Administrator console doesn't contain any safeguards to prevent you from performing management actions against Exchange 2000/2003 servers. You just have to remember not to use it to manage your Exchange 2000/2003 servers.

System folders and public folders

Moving system folders and public folders works differently in Exchange mixed mode than it does in native mode. Because of problems with mail delivery to moved folders, Microsoft has disabled the ability to move system folders and public folders between routing groups in mixed mode. You can only move system folders and public folders across routing groups in native mode.

Administrative groups

In native mode, you can move mailboxes from one administrative group another. To the best of my knowledge, this feature was previously unavailable in mixed mode, until Microsoft enabled it in Exchange Server 2003 Service Pack 1. But in mixed mode, the administrative groups are still limited by the existing routing group structure (remember that Exchange 5.5 uses sites instead of routing groups); they cannot span multiple routing groups.

Query-based distribution groups

The major Exchange 2003 feature that you really miss out on if you run Microsoft Exchange in mixed mode is query-based distribution groups, which allow you to create dynamic distribution groups based on the results of an LDAP query against Active Directory.

For example, you could create a distribution group that contains all employees who work in the finance department. Because of this function's Active Directory dependency, it does not work in mixed mode.

About the author: Brien M. Posey, MCSE, is a Microsoft Most Valuable Professional for his work with Windows 2000 Server, Exchange Server and IIS. Brien has served as CIO for a nationwide chain of hospitals and was once in charge of IT security for Fort Knox. As a freelance technical writer he has written for Microsoft, TechTarget, CNET, ZDNet, MSD2D, Relevant Technologies and other technology companies. You can visit Brien's personal Web site at http://www.brienposey.com.


Do you have comments on this tip? Let us know.
Related information from SearchExchange.com:

  • Learning Guide: Exchange Server migration
  • Tip: From Exchange 5.5 to 2003 in a single bound
  • Reference Center: Exchange migration tips and resources



    This was first published in November 2005

  • There are Comments. Add yours.

     
    TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

    REGISTER or login:

    Forgot Password?
    By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
    Sort by: OldestNewest

    Forgot Password?

    No problem! Submit your e-mail address below. We'll send you an email containing your password.

    Your password has been sent to:

    Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.