We like entry #15, although we still require the logo to have a more "corporate" feel to it.
If you could make it more crisp (i.e. remove feathering on the edges), and take another shot at making it appeal to a fortune 500 audience, it would align with our brand much more.
could you resubmit #213 with the angles on C and O being the opposite (extend the letters a bit more and have the angles go / and \ respectively if they are considered \ and / right now... let me know if I'm making sense.