Microsoft may have revealed a list of what's new in the recently released Windows 10 PC preview build 14279 for Insider members, but one interesting new feature has popped up that was not on that list. Users who also own a Windows Phone or Windows 10 Mobile device have discovered that some of their older SMS messages are now showing up on the Messaging + Skype PC app.
Based on our many tips, it appears that users cannot respond to those older texts yet. However, since this is a preview build, we can expect changes and improvements in this feature to be added in future Insider releases.
Thanks to everyone for the tips!