Having a sick day, I jumped at the opportunity to download and install the latest Windows 8.1 release on my Asus ROG Tytan CG8480 Windows 8-based gaming pc. Since the update came at a solid 3.4GB I decided to let Windows handle this one on its own. When I came back to check out my new Windows system, I was informed that Windows unfortunately couldn’t complete the update. Windows 8.
So your phone has been syncing your mail, calendar and contacts with Office 365 (Exchange Online) for months without problems when everything suddenly comes to a halt.