Salesforce.com has quietly acquired a startup called EntropySoft, a maker of content management and integration software, in a move likely meant to bolster Salesforce.com's Chatterbox service. The acquisition was first reported late Tuesday by VentureBeat. As of Wednesday, EntropySoft's website redirected to a page stating the company had been acquired by Salesforce.com. A Salesforce.com spokesperson confirmed the deal had occurred, but would not provide any further details regarding the rationale for the purchase, or even when it occurred.