Microsoft has been trying to get more developers to release their apps for the Windows Phone platform, but there's also a problem with major app creators and publishers that don't bother to update them with new features or improvements for months. In a couple of cases, the apps haven't been updated for nearly a year.
Microsoft recently revealed a new Developer's Code of Conduct for Windows 8.1 and Windows Phone apps that stated, among other things, that developers must stay active in the store. That's certainly not the case for these five popular free apps, which have seen numerous feature and bug fix updates for their iOS and Android counterparts over the past year. In fact, most of these apps have seen some update in the past month for those two platforms, and none have been updated later than early September. That is certainly not the case for their Windows Phone versions.