Topic Last Modified: 2009-02-09

The Microsoft Exchange Server Best Practices Analyzer reads the following registry subkey to determine whether the Track Duplicates registry entry is present:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\<ServerName>\Private-<MailboxStoreGUID>\Track Duplicates

If the Best Practices Analyzer finds that the Track Duplicates entry is missing, the tool generates an error message.

If the Track Duplicates registry entry is missing, you may experience one or more of the following symptoms in the Exchange organization:

To address this issue, re-create the Track Duplicates registry entry.

This topic contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.
To create the Track Duplicates registry entry
  1. Click Start, click Run, type regedit, and then press ENTER.

  2. Locate and then click the following registry subkey:


  3. Create the following registry entry:

    Value name: Track Duplicates

    Value type: REG_ DWORD

    Value data: 1

  4. Exit Registry Editor.

  5. Dismount and then remount the affected information store databases. Alternatively, you can restart the Microsoft Exchange Information Store service.

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