When you use Microsoft Office Outlook 2007 or Microsoft Office Outlook 2003 in Cached Exchange Mode, Outlook verifies and resolves the names of e-mail recipients with the Offline Address Book. The process of resolving e-mail addresses with similar fields, such as the DisplayName, is called Ambiguous Name Resolution (ANR).

The Online ANR that is used by the Global Catalog Server indexes the following fields for matching names:

•	displayName
•	mail
•	givenName
•	legacyExchangeDN
•	mailNickname
•	physicalDeliveryOfficeName
•	proxyAddresses
•	name
•	sAMAccountName
•	sn

The ANR that is used by the Offline Address Book indexes the following fields for matching names:

•	mailNickname
•	displayName
•	physicalDeliveryOfficeName
•	sn

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WORKAROUND

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In Outlook, you can use the new registry key named ANR Include Online GAL to set the address book that Outlook uses to resolve ambiguous names or e-mail aliases. You can use one of the following registry entries to set the ANR Include Online GAL registry key manually or with Group Policy:

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In Outlook 2003

Manual Setting:Group Policy Setting:Parameter:ANR Include Online GAL
Type: REG_DWORD
Value: 0 or 1

The value 0 is the default value for the Offline Address Book. If the value is set to 0, Outlook 2003 uses the Offline Address Book to resolve ambiguous names or e-mail aliases when you create an e-mail message.

If the value is set to 1, Outlook 2003 uses the Global Address Book to resolve ambiguous names or e-mail aliases when you create an e-mail message instead of using the Offline Address Book. This means that there will be Remote Procedure Calls (RPC) incurred whenever the following conditions are true:

•	A name is resolved in the To box of an e-mail message.
•	An e-mail message is sent.
•	A reply is sent to a one-off SMTP address.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

You can manually add the ANR Include Online GAL registry key to the registry.

Follow these steps, and then quit Registry Editor:

1.	Click Start, click Run, type regedit, and then click OK.
2.	Locate and then click the following key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Cached Mode
3.	On the Edit menu, point to New, and then click DWORD Value.
4.	Type ANR Include Online GAL, and then press ENTER.
5.	On the Edit menu, click Modify.
6.	Type 0 or 1, and then click OK.

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In Outlook 2007

Manual Setting:Group Policy Setting:Parameter:ANR Include Online GAL
Type: REG_DWORD
Value: 0 or 1

The value 0 is the default value for the Offline Address Book. If the value is set to 0, Outlook 2007 uses the Offline Address Book to resolve ambiguous names or e-mail aliases when you create an e-mail message.

If the value is set to 1, Outlook 2007 uses the Global Address Book to resolve ambiguous names or e-mail aliases when you create an e-mail message instead of using the Offline Address Book. This means that there will be Remote Procedure Calls (RPC) incurred whenever the following conditions are true:

•	A name is resolved in the To box of an e-mail message.
•	An e-mail message is sent.
•	A reply is sent to a one-off SMTP address.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

You can manually add the ANR Include Online GAL registry key to the registry.

Follow these steps, and then quit Registry Editor:

1.	Click Start, click Run, type regedit, and then click OK.
2.	Locate and then click the following key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Cached Mode
3.	On the Edit menu, point to New, and then click DWORD Value.
4.	Type ANR Include Online GAL, and then press ENTER.
5.	On the Edit menu, click Modify.
6.	Type 0 or 1, and then click OK.

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