Microsoft said Monday that it is eliminating the ability to link accounts within, replacing them with aliases instead.

Currently, Outlook users can link their account with others from within Outlook allows users to not only read email from within the context, but also send emails as if they were in those other domains.

Now, according to Microsoft, those Microsoft accounts will be unlinked, and made inaccessible to In the near term, Microsoft will begin unlinking those previously linked accounts. Instead, Microsoft has proposed an alternative: using aliases instead.

What's the difference between an alias and a dedicated email address? An alias can provide anonymity for users, without being tied to an actual account. Let's say that one owned the email address Using the alias feature that Microsoft pushed to the public in 2011, one could set up, hand that email out to the public, and receive email sent to that address. As an alias, wouldn't require a dedicated password; if that address was set up as a second, linked account, it would.

Why is this important? Security. According to Microsoft, owners who used the secondary accounts less frequently didn't pay as much attention to them. That can mean that those secondary accounts become a back door of sorts into your main accounts.

"We've found that quite often, people who use linked accounts keep their primary account's security info (including password and proofs) up to date, but don't lavish as much care on their secondary accounts," Eric Doerr, a group program manager for Microsoft, wrote in a blog post. "It's easier for a malicious party to compromise one of those secondary accounts, which gives them full access to your primary account. Note that if we detect suspicious activity in your account, we automatically unlink accounts to try to help prevent this abuse, but we think we need to go further."

:story; InfoWorld