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[WPCentral Question]

downloading apps from store

 

[Harrie-S]

Make sure date and time are correct...

Remove any restrictions in Data Sense...

Manually sync account... Settings > email + accounts > hold down on Microsoft Account name > tap "sync" when the popup menu appears.

If it does not sync manually, reboot and try again. If that still fails you have a deeper issue with your Microsoft Account. Go online with a PC and browser to reset your Microsoft Account password and try to sync again on the phone with the new password.