Welcome to Career Moves, Fierce's weekly rundown of recent hirings, firings and retirings across the tech and telecom sectors. Come back to us each week to keep up with personnel news from the companies that matter most to you. If you have news from your company or think we missed something, send us an email at fiercenetwork@questex.com to be featured in next week’s update. Week of Feb. 23 Airtowe...