So…is an Executive MBA the same as a regular MBA, just offered with a schedule that accommodates working adults? That's what I'm finding Googling…
If so, then I'd say most MBAs are executive MBAs, since most MBA students are individuals who are working full-time and can't just take a year or two off of work to go to school full-time. If EMBA is just an MBA that can be taken while working, then I'm getting an EMBA currently, though I'd never seen it labeled as such. I'm taking 1 course at a time (accelerated courses, so 2 per semester), exams are on the weekend, and I work more-than-full-time (as do pretty much all accountants…) at the same time.
The only other common feature of executive MBAs that I saw was some flexibility in the course work (i. e., instead of having to get it in Accounting and take x Accounting hours, you can get it with no specialization and just take core courses and electives); that's also offered through my school, though not labeled an “EMBA”.