Thanks to a bunch of new features and back-end platform changes coming to Outlook.com webmail, users won't see much difference between the two products.
As of late Tuesday night, users of Microsoft's online mail services have been bumping into trouble syncing and sending mail.
Microsoft's video chat service is now integrated with Outlook.com for those outside the handful of countries that were part of the initial release.
Those trying to access Microsoft's Hotmail and Outlook.com from iPhones, iPads, Android phones, and other mobile devices are continuing to encounter problems.
In the name of enhanced security, the tech giant is having users tie their linked e-mail and other accounts to one single Microsoft account.
The integration of the video chat and messaging service with Microsoft's free e-mail service is rolling out to U.K. users now and will be available in the U.S. "in the coming weeks."
Six months after it first unveiled Outlook.com, Microsoft will start phasing out its Hotmail and begin moving users over to its new product.
More than 1 million people sign up right off the bat for the new Outlook.com, Hotmail's successor and Microsoft's bid to keep users from jumping ship to Gmail and other rivals.
Rogue, hard-to-delete cookies may be the culprit thwarting some testers from signing up for Microsoft's newly launched Outlook.com Web mail.
In a policy change, the tech giant will let users of online services such as Outlook.com email know if they've become targets of government-sponsored attackers.