Instead, the Redmond software behemoth has created versions that work on iOS and Android phones.
Once a password is entered into Authenticator, it removes the need for entering the same again when using a Microsoft account on another site.
One can enter one's username when signing in somewhere new and then a notification is sent to the phone of the user, with an Approve button. Once this is pressed, the user can gain entry.
Explaining why, Microsoft's Alex Simons wrote: "A few people have asked if this works with (the) Windows Phone version (of) Microsoft Authenticator.
"Windows Phone makes up less than 5% of the active users of our Authenticator Apps so we have prioritised getting this working with iOS and Android for now.
"If/When it becomes a big success on those high-scale platforms, we will evaluate adding support for Windows Phone."