Web Services, Web services or web services?

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I'm using the word 'Web Services' in the middle of a sentence... I've found the capitalization seems to vary by person, industry, topic and/or vendor. Which is the correct sentence? 

Business has benefited from our Web Services strategy.

Business has benefited from our Web services strategy.

Business has benefited from our web services strategy.

 

Answers on a postcard to this address. <g>