My current situation is as follows:
I have received an offer from a small firm. I have verbally accepted the offer and I should be starting in a few weeks. The terms of my employment are at-will employee with initial probationary period. After the probationary period I am to become a full-time, at-will employee. The employer is eager for me to start.
During this two week period before starting work, I am still interviewing and trying to obtain additional offers. The offer I currently have is lacking in several respects (salary, etc) and so I am trying to get better offers. My question is as follows:
May I accept another offer of employment and notify my employer before even starting the probationary period that I will not be working there anymore? How does this fare in the job market? If this current employer is upset, will it be justified?
EDIT: This question is different from "What to do? I have one interview for a great company, another one called me today! " because I have verbally accepted the offer, and I am trying to figure out how the at-will status affects this situation. In the other question had no concern for at-will status as the user had not accepted the offer yet.