have 8 again now... I had 8 and dl 10, lost everything in my mail box that was saved in files, it kept saying it was syncing, so after 3 days of it not transferring my mail files from 8 to 10 I removed 10 and went back to 8. gave it about 2 weeks to see if they had fixed the sync problem and dl 10 again... same problem. so restored 8 and said to heck with windows 10.
May not have been so bad but I was in the process of taking a trip to the Philippines and my confirmation emails and reservations were stored in my mailbox and windows 10 never would bring them to the windows 10 mail box.