Managing personal Outlook.com account settings, security, and privacy
There are valid reasons why they are changing ....
ZigZag3143,
If there are (as you say) "valid" reasons why Microsoft has disabled auto-complete in the sign on page, then why do they refuse to share those "valid" reasons with their customers?? What have they got to fear (if the reasons are "valid")? Of course they do not "owe" us customers an explanation, but providing one would improve their customer service (that is, if they even care about customer service anymore).
You once stated that you have "higher up" contacts in Microsoft .... so why not ask those "higher up" contacts to have the courtesy of explaining the reasons why auto-complete is disabled in the sign on screen.
Even if Microsoft has plans to use the sign on screen to allow customers to sign-in to multiple applications/services ... why not allow auto-complete to work when filling in one's username when signing in to any of those applications/services???? How would allowing auto-complete in the sign on page impact ones ability to sign in to multiple applications??? Auto-complete merely lists those matching usernames that one has previously used when signing in. One can select one of the matching usernames, or type a different one. Also, one can easily set browser parameters to not remember ones password. Auto-complete only remembers usernames.
Instead of a drive-by ... why not be more helpful. If you think there is a valid reason for disabling auto-complete, then why not share it with us? Be specific. Explain exactly what problem is being solved by disabling auto-complete in the sign on page.