Windows 10: Windows 10 Mobile build 10151 shown off on video

Read more: Windows 10 Mobile build 10151 shown off on video, new app animations highlighted

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Grouped Mail Accounts No Longer Have Notifications, Accounts Shown as 'via Outlook Calendar' on Notifications & Actions

Installed Software and Versions

• Hardware: Alcatel Idol 4S
• Windows 10 Mobile OS Build: 10.0.15063.297
• Outlook Mail and Outlook Calendar 17.8126.42378.0

After updating to the Windows 10 Mobile OS build above, all of my mail accounts (setup for Outlook, Gmail, and Exchange) no longer show a notification at all in the Notifications screen. They used to show up in the group for Outlook Mail, but now they show
up in Notifications & Actions (where you can toggle notifications on and off) as something like 'Gmail (via Oultook Calendar)'. However, Gmail only has it set to sync e-mail, not calendar. There is still an Outlook Mail notification item, but nothing is being
shown in there.

 

Downgrading my OS from windows phone 10 to windows phone 8.1

Yes, currently the Microsoft Mobile servers contain only firmware files which do not come with Windows 10 Mobile but with Windows Phone 8.1. The tools reinstalls the firmware, however, with the OS build shown. Therefore that way, you get Windows Phone 8.1.
The name of the button is misleading. Please, ignore its wording.

If you want to upgrade to Windows 10 Mobile again, you have to go for the app Upgrade Advisor afterwards. If you just want to reset your phone but keep the current OS build: All apps » Settings » System » About » Reset your phone.