Microsoft clarified that the Timeline feature for Windows 10 isn't going away. It is, however, losing the ability to sync activity across devices when using a Microsoft account. AAD-connected accounts will continue to be able to sync activity across devices. When Microsoft announced Windows 10 build 21359 for Dev channel Insiders, one change started making the headlines. Starting with that build, the Windows 10 Timeline feature stopped having the ability to sync activity across devices when using a Microsoft account. This led many to believe that the timeline feature is on the way out. That doesn't exactly appear to be the case, though some major functionality of the feature is going away.