Part 3: Contact Management in VB.NET

Drawing QR Code in VB.NET Part 3: Contact Management

Part 3: Contact Management
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Using LDAP Directory Services closely target the information you re trying to find, but to do so, you must understand what the search base really is.
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Figure 16-4. A query with no search base returns all objects with e-mail addresses.
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cn=common name ou=organizational unit o=organization c=country dc=domain
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Active Directory drops the c= attribute and adds the dc= attribute.
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For example, assume you want to search the users container in the domain boyce.us. The search base would be as follows: cn=users,dc=boyce,dc=us Notice that the domain is represented by two dc attributes. If the domain you are searching is microsoft.com, you would use dc=microsoft,dc=com instead. Or, if your domain does not use a Domain Name System (DNS)-compliant domain name (as in a Windows NT domain), you would simply specify a single dc attribute for the domain name.
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Each entry in the directory has a distinguished name, which is a fully qualified name that identifies that specific object. Relative distinguished names (RDNs) are concatenated to form the DN, which uniquely identifies the object in the directory. RDNs include the following:
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Part 3: Contact Management
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Microsoft Office Outlook 2003 Inside Out In some cases the part of the directory you want to search will be in a specific organizational unit (OU). Or, you might be setting up multiple LDAP accounts in Outlook, each configured to search a specific OU. For example, perhaps your company has Sales, Marketing, Support, External Contacts, and a handful of other OUs, and you want to configure an LDAP query for each one. One solution is to add an LDAP service for each and configure the search base accordingly. For example, let s say we re configuring an LDAP service account to query the Support OU in the boyce.us domain. The search base would be as follows: ou=support,dc=boyce,dc=us Keep the following points in mind when deciding on a search base:
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Specifying no search bases causes Outlook to retrieve objects from the entire directory. Specifying a search base sets the branch of the directory to search in the directory tree.
If you decide to include a search base, determine the common name for the object or OU, then add the domain. You can t specify just the ou or cn attributes without the domain, but you can specify the domain by itself to perform a top-down search of the domain. Tip If you need to search different branches of the directory tree, you can add multiple LDAP service accounts to your profile, each with the appropriate search base. Or, add only one LDAP service account, then simply change its search base when you need to query a different branch.
Troubleshooting
Your LDAP query returns this error message: There Are No Entries In The Directory Service That Match Your Search Criteria Sooner or later, you ll attempt to query an LDAP server that you know contains at least one item meeting your search criteria but you ll receive an error message telling you that no entries in the directory service match your criteria. One possible cause of this problem is that the search option specified at the LDAP server might be preventing the query from completing successfully. For example, you might be issuing an any query, but the server is configured to treat such queries as initial queries.
For a detailed discussion of query types and how to configure the search option, see Configuring Exchange Server 5.x LDAP Properties, page 464.
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You might also receive this error message if you ve incorrectly set LDAP directory service account properties for example, you might have configured the account to use port 389 when the server requires SSL. Check your directory service account settings to ensure that you have specified the proper server name or address, port, and search base.
Part 3: Contact Management
Using LDAP Directory Services
Configuring a Directory Service Account in Outlook Express
You can use Outlook Express as well as Outlook to perform LDAP searches. This capability can be handy when you re working on a system that does not have Outlook installed, such as a notebook computer that you use infrequently. You can access LDAP queries by using the Outlook Express address book or by using the search/find feature of your operating system.
For an explanation of how to perform LDAP queries through your operating system, see Searching from Windows, page 462.
To configure Outlook Express LDAP directory services, follow these steps:
1 In Outlook Express, choose Tools, Accounts. 2 In the Internet Accounts dialog box, click Directory Service to display the Directory
Service tab (see Figure 16-5).
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