In a bid to purge insecure software from the Windows Store, Microsoft Tuesday announced that it would remove apps that it deems to have critical vulnerabilities. Within 180 days, Microsoft said, those apps must either be patched or they will be removed. And if an insecure app is being exploited in the wild, it risks getting pulled even sooner, executives said. The policy will also be extended to apps found in the Windows Phone Store, Office Store, and Azure Marketplace.