This article was previously published under Q325314
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
If you type a full user name in the Display Name field in the Find dialog box of your address book when you try to search a Lightweight Directory Access Protocol (LDAP) server in Outlook 2002, Outlook 2003, Outlook 2007, or Outlook 2010, you may receive one or more of the following errors:
Unable to display results because too many entries in the Internet Directory match your search criteria.
The search could not be completed. MAPI_E_CALL_FAILED.
Cannot contact the LDAP server (81) error.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require you to reinstall the operating system. Microsoft cannot guarantee that these problems can be resolved. Modify the registry at your own risk.
To resolve this problem, obtain the latest service pack for Microsoft Office XP. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
307841 How to obtain the latest Office XP service pack
After you install the latest Microsoft Office XP service pack, follow these steps:
Exit Outlook 2002.
Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
Verify that the following key exists. If it does exist, go to step 5.