WalkingCat, an often active source of tech rumours on Twitter, stumbled across Microsoft's pilot page for the service (as WinBeta spotted), which spills the full details of what Outlook.com Premium will offer.
It will boast a fully ad-free inbox, and the service will give you five personalised email addresses with custom domains which will be provided by GoDaddy (of course, the exact domain you want will be subject to availability). You'll get the domain free for the first year, but will subsequently have to pay a subscription to GoDaddy.
Calendars, documents and contacts will also be automatically shared across these five email addresses, so staying connected is made as easy as possible.
As mentioned, Outlook.com Premium will apparently be free for those who subscribe to Office 365, the online version of Microsoft's productivity suite. As to when the service will actually go live, that's not clear yet – it's still being tested and is invitation-only right now.
Indeed, there's no guarantee it will go live, although it's certainly looking promising from what we see here. Those who want to manage their own custom domains via Outlook.com best keep their fingers crossed that the scheme doesn't get derailed at the last minute.
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Darren is a freelancer writing news and features for TechRadar (and occasionally T3) across a broad range of computing topics including CPUs, GPUs, various other hardware, VPNs, antivirus and more. He has written about tech for the best part of three decades, and writes books in his spare time (his debut novel - 'I Know What You Did Last Supper' - was published by Hachette UK in 2013).