New
#1
Mail App
Windows 10 Mail app is storing all manually entered email address to use as an auto-fill option if you type the first letter of that address again.
If you happen to type in an incorrect address it is impossible then to remove.
It seems to create a fake or dummy contact in the 'People' app which again has no option to be deleted or removed.
I'm finding this extremely frustrating as the incorrect addresses have spread across all my Windows 10 devices!