Add another user with this problem.
I was able to add a personalized e-mail address months ago. I just sent an email to it from a different provider and it still works. However, the option to add another personalized e-mail address also disappeared from my settings also, which was what I wanted
to do as well. Just like a previous poster, I was probably "grandfathered" as well with the old address I made that long ago...?
Concerning the link that discusses that Outlook.com Premium is retiring the feature... am I right in understanding that Outlook.com Premium is not the same thing as Office 365 Home? Maybe Microsoft is retiring the feature for Office 356 Home as well?
That would be disappointing... it would be another reason for people to go somewhere else. It would also be a hassle for me, personally. I'll be following this discussion as well until there is an official statement posted by Microsoft
on whether they are working on it or retiring it. I wouldn't be surprised if the "grandfathering" of the old addresses will stop as well sometime in the future.