If you upgraded to Windows 10 Mobile and are missing contacts, email, or calendar items, make sure your phone is updated, and re-add your Microsoft account.
On Start , swipe over to the All apps list, and then select Settings > Update & security > Phone update.
Select Check for updates and follow the instructions to update your phone.
Go back to Settings , and select Accounts > Your email and accounts.
Under Email, calendar, and contacts, select Add an account. Add your main Microsoft account email address again.
Your contacts should now be restored.
Article ID: 4027427 - Last Review: 2017, ഓഗ 11 - Revision: 1