After you upgrade the global catalog to Windows Server 2003, you receive an error message when you use Outlook 2000 or an earlier version to resolve aliases or to connect to a server that is running Exchange Server

You upgrade the global catalog to Microsoft Windows Server 2003. When you use Microsoft Outlook 2000 or an earlier version to resolve aliases by clicking Check Names, you receive an error message that is similar to the following:Alternatively, when you use Outlook 2000 or an earlier version to connect to a server that is running Microsoft Exchange Server, you receive an error message that is similar to the following:

This issue occurs because the Windows Server 2003 security templates are more secure than the Microsoft Windows 2000 security templates.

To resolve the issue, follow these steps:

1. On the global catalog that was upgraded to Windows Server 2003, click Start, point to All Programs, point to Administrative Tools, and then click Domain Controller Security Policy.
2. Expand Local Policies, and then click Security Options.
3. Set the policies as listed in the following table.
   Collapse this tableExpand this table

   Policy Name	Status
   Network access: Allow anonymous SID/Name translation	Enabled
   Network access: Do not allow anonymous enumeration of SAM accounts	Disabled
   Network access: Let Everyone permissions apply to anonymous users	Enabled
   Network security: Do not store LAN Manager hash value on next password change	Disabled
   Network security: LAN Manager authentication level	Send LM & NTLM response

4. Close the Domain Controller Security Policy console.
5. Click Start, click Run, type gpupdate /force, and then click OK.
6. On the Exchange server, click Start, click Run, type services.msc, and then click OK.
7. Locate the Microsoft Exchange System Attendant service, click Restart Service on the toolbar, and then close the Services console.