<A target="_blank" href="http://www.zdnet.com/blog/microsoft/dont-forget-microsoft-is-supposedly-working-on-a-windows-app-store-too/7746">A Windows App Store was (supposedly) announced earlier this year</A>. It was rumored to be ready in time for the release of Windows 8. But. Apple's Mac Store is due to open in 90 days. Why is Microsoft taking so long?