Some solid advice by members here made me reconsider an MBA application to my undergraduate alma mater. Obviously the alumni access aspect varies tremendously depending on school size and overall campus culture. But whenever I have made the effort to do so, I as an undergraduate alumnus, have successfully been able to tap into my university's MBA network for informational interviewing and general career advice. Understandably however, not every MBA grad I approached was always willing to help - but that's not really remarkable in itself.
So, to me it certainly seems feasible that
to some extent at least I would have an "in" with my alma mater's MBA alumni regardless of where I went for an MBA. And going elsewhere for an MBA would potentially give me access to that university's undergraduate and professional schools' alumni, too!
In addition, I also felt that returning for a professional education to the same school I did for undergrad would mean missing out on a lot of the experience that comes with being a student in a "new" city. Moreover, I had no intentions of settling down post-MBA in the general geographic area my alma mater was located in anyway.