It's been over a year since Windows 7 SP1 was released. Starting this week, Microsoft has stopped making the service pack optional – it can no longer be blocked by the Windows <a href="http://www.microsoft.com/download/en/details.aspx?displaylang=en&amp;id=22464">Service Pack Blocker Tool Kit</a> — a Microsoft utility that lets corporate system administrators control when service packs are installed on their systems.