Outlook 2016 is not updating automatically
What this means is that you can, if you like, switch to a different desktop email program completely.
I generally recommend Thunderbird, but any email program capable of POP3, IMAP, and SMTP will do just fine.
The new Outlook.com delivers an exciting set of new experiences across web, phone, and desktop, and we’re eager for you to start using it.
Unfortunately setting up a new email program will cause all of your email to be downloaded again.
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Rest assured, you can always access your email by logging into Outlook.com from any web browser, and you will continue to have access to all your data that is currently in Windows Live Mail 2012. What the announcement failed to mention is that POP3 [Post Office Protocol version 3] email from an email server or provider.
POP3 is used by email programs like Thunderbird, Microsoft Office Outlook, and others use to communicate to mail servers when downloading your email.