Agreed. Even basic things like send/receive progress is missing from Windows 10 Mail.

On the page in outlook.com settings where you set your alias up, the last option there is 'Default "From" address'.

You're welcome.

Probably already mentioned, but I have found that Install.esd resides in "C:\$Windows.~BT\Sources\​" even when I've successfully installed the update (tried with 10162 and 10166)

To the OP. Did you ever resolve your issue? I have the same problem. Gigabit wired connection, only writing at around 2 MB/s to my NAS whereas my Windows 7 Desktop will write at around 30 MB/s.
...