Configuring preferences and options in Outlook.com
I managed to solve the problem in Spark, about login to Hotmail. I logged in to Hotmail by confirmation through the authenticator, then reset the password with 1Password, so I have a record of that. Then I entered that in the Spark login process and it gave me no more grief at that stage. In all four of my email clients I'm now able to send mail from the Hotmail address, but none of them can receive mail.
As for creating an alias address as a way to "merge" the Hotmail and Outlook accounts in Microsoft's webmail, I tried that. I first by logged in to the @outlook.com account and tried to add the @hotmail.com address as an alias. That was rejected, with error message saying that it is a "reserved address," whatever that means.
I then logged in to the @hotmail.com account and tried to add the @outlook.com address as an alias. That was also rejected, saying simply that the address was not available.
I see that before 2013 Microsoft allowed merging accounts, but withdrew that option on grounds of concern for users' security. All in all, I think Microsoft mail is hugely inconvenient. iCloud mail and Gmail are far more reliable and easy to use. What's the problem? Is Microsoft so heavily weighted toward business users that they can't be bothered with individual home users' concerns?
Thomas