I cannot get sms syncronization between devices to work in WP10. I had to do a hard reset of my phone, and the old sms doesnt come back. The sms's are listed if I go into a contact on my PC it lists the sms's in the log on the person. This does not happen on the WP10. And the old sms's are not visible in the Messages either. I use the same email as main email on the devices. The sms backup option that's described in the documentation for Windows 10 does not appear either.