Munsell says Microsoft is upgrading other apps that access the Messenger service on a case-by-case basis, including mobile apps.

"On products like Xbox, we'll make announcements at a later date when we have dates to actually announce to customers." The software maker has also notified third parties about its plans to retire the entire Messenger service.

Microsoft is helping users transition with a set of online tutorials.

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Microsoft has been testing its migration plans with a test cell, so a very small number will move over on March 15th, but 99 percent of users will start shifting across from April 8th onwards.

"The upgrade process itself has been going really well, we've had millions of customers move over," says Skype's Parri Munsell.

If you install a Skype client then you'll run into an issue with dual notifications.

Munsell admits this is a possibility, but that "the customer just needs to configure those clients so that they're doing pop-up notifications on the one that they want to reply on." It's not an ideal situation, and if you have linked Facebook contacts to your Skype account then you could end up with three contact entries for the same person: Messenger, Skype, and Facebook.

If you pull the KB entry for the upgrade (KB3146449), it reads: “This update adds functionality to Internet Explorer 11 on some computers that lets users learn about Windows 10 or start an upgrade to Windows 10.”But, in contrast to what some sites are reporting, it’s not clear what the browser update actually did.

I actually installed the patch on my own system, since I’m still running Windows 7, and I have yet to observe any significant difference in the browser.

If this first sign of integration helps move Microsoft towards Skype in every product to compete against services like Whats App, i Message, Google Talk, and others then it will benefit all who rely on Microsoft's ecosystem of software and services in the long run.

For decades, Microsoft has split its patch offerings between security updates, bug fixes, and feature updates.

The giant pop-overs that prompt users to upgrade to Windows 10 started appearing on after Windows 10 went live, not as a result of this update.

Here’s a screenshot of my pre-patched version of IE11: The post-patch screenshot is identical.

Microsoft will be migrating users depending on their language, starting with English first and ending with Portuguese no sooner than April 30th.