How to Temporarily Ignore Unknown Users on an Exchange Server 2003 Server that Holds Public Folder Replicas

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You can set a registry key that tells Exchange to ignore unknown users in the ACL while Exchange is in mixed mode. Setting this registry key causes a mixed-mode Exchange Server 2003 public folder server to temporarily ignore unknown users in the ACL.

Before You Begin

It is recommended that you only set this registry key when it is necessary. For example, if you have a small subset of unknown users, and they can all be safely removed from public folder ACLs. Otherwise, if the user was temporarily unknown because of a replication delay, you will lose the permissions information for that user.

Be aware that ignoring unknown users means that if those users have Access or Deny permissions on public folders, those permissions might be lost. It is not recommended that you ignore unknown users on a long-term basis.

Warning

Incorrectly editing the registry can cause serious problems that might require you to reinstall your operating system. Problems resulting from editing the registry incorrectly might not be able to be resolved. Before editing the registry, back up any valuable data.

Procedure

To temporarily ignore unknown users on an Exchange Server 2003 server that holds public folder replicas

  1. Set the following registry key:: HKLM\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\Ignore zombie users = <nonzero value>

    This is a DWORD value. If the value is zero or if the key is not present, Exchange Server 2003 handles unknown users normally.

  2. Restart the Microsoft Exchange Information Store service.

For More Information

For more information, see: