Hi 29er fans

I have a GF Utopia I think it is a 2007 model with 700c road bike wheels currently fitted.

I was thinking about getting some better wheels and was wondering if it was possible to fit 29 rims. Its a commuter only and there is quite a bit of clearance with the thin tyres I have on the 700c's now.

Is there much difference in size of 20er rim compared to the 700c. ?

Anyone done it / seen it.

Is this frame actually a 29er frame anyway.