Windows phone 8.1 won't sync anymore

[conteminimo]

Hello,

Since December 8th, my Lumia 635 (Windows Mobile 8.1) won't sync anymore, neither contacts, neither Outlook, photos, anything.

Within Outlook I got the error 80070490 when trying to synchronize the device.

I've used eas.outlook.com as server, but I tested also m.hotmail.com, m.outlook.com with no luck.

I soft reset didn't help.

I got another mobile with Windows Mobile 10 installed and got no problem with it.

Any clue?

End of Support = end of my Windows Phone 8 life?

Thanks for your help

Michele