This may possibly sound like a stupid question but can I mute the system notification sounds when I have headphones plugged in?

Last night I was happily watching a video with headphones when an...

It appears that the Mail app wants to show all messages in nasty 'Times New Roman' or similar.

Does anyone know how to change default font that the Mail app uses? I can't find anything in the...

I also had this e-mail just after upgrading. I only own one Windows device and that's all I see if I look in my accounts' Devices page. I have resisted the prompt to delete this device... :)