Microsoft announced that iTunes for Windows will be coming to the Windows Store, according to TechCrunch:
Here is a surprise: at its Build developer conference, Microsoft today announced that Apple’s iTunes will come to the Windows Store by the end of the year. The iTunes app will have full iPhone support and users will essentially get the same iTunes experience from the Windows Store app that the existing Windows app currently offers.
There are two points of significance: one is that Microsoft announced this, not Apple. The second is that this is the only way Windows 10 S users can get iTunes for Windows. That makes a Windows Store version a must-have for iPhone owners with Surface Laptops running that flavor of Windows.