(Editor's note: In an email to CMSWire, a Marketo spokesperson challenged the accuracy of this story, claiming there is "complexity around the platform and architecture." Marketo executives believe CMSWire did not accurately portray "the distinction and timing between the platform and the architecture."  She said the platform, "called the Marketo Engagement Platform," is made up of three functional areas: an Engagement Marketing Hub, Marketo Marketing Apps and Partner Apps. "At this time, all customers are on the platform. The big data architecture, developed under the codename Project Orion, is what powers the Engagement Platform," she said, noting that Marketo began a phased roll out to Marketo customers in the third quarter last year. Her explanation does not square with the original messaging CMSWire received from Marketo executives last May, which we consistently reported in our stories.) Marketo today took steps to address confusion

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