Microsoft does RDF
By bblfish on Dec 13, 2006
In a very interesting slideshow "The Dark Side of the Semantic Web" Jim Hendler points to Microsoft's "Connected Services Framework 3.0 Profile Manager" documentation.
There are two main benefits offered by a profile store that has been created by using RDF. The first is that RDF enables you to store data in a flexible schema so you can store additional types of information that you might have been unaware of when you originally designed the schema. The second is that it helps you to create Web-like relationships between data, which is not easily done in a typical relational database.
A little further
You must use the the Simple Protocol and RDF Query Language (SPARQL) to read profile information from Profile Manager. SPARQL is an industry standard. For more information, see What is SPARQL?