The default Microsoft Active Directory schema is full of attributes. If you by chance pick some unused attributes and reuse them for your own purposes, there’s a caveat – some attributes are indexed and some other are not. And as you can expect – this makes a huge difference if your business processing relies on searching the AD database.
Fortunately, AD can be reconfigured to create an index over any attribute. These articles describe all required steps:
http://technet.microsoft.com/en-us/library/cc755885(WS.10).aspx
http://technet.microsoft.com/en-us/library/aa995762(EXCHG.65).aspx
In short:
- You have to be in “Schema Admins” AD group
- You have to install the Active Directory Schema MMC snapin (just regsvr32.exe schmmgmt.dll and the snapin will be available)
- Run the snapin “as the administrator” from the shell
- Locate your attribute, double click it and check both “Index this attribute” and (optionally) “Replicate this attribute to the Global Catalog”
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