While happenings in the mobility sector dominated the news again last week, it’s the outlook for IT jobs that leaves us the most optimistic. Indeed, it seems tech job openings are on the rise in just about every major U.S. city. Meanwhile, for those of us handicapping the ongoing smartphone battles, the latest news shows Windows Phone 7 sold out in Europe even as the BlackBerry OS continues to dominate market share in the U.S. Other big news? Microsoft’s efforts to appeal to small businesses with a new server offering, and the latest zero-day exploit hits Internet Explorer. Read on for the week’s five hot topics.