Update: Windows Insider chief Gabriel Aul has shed a bit more light on this update, noting that it indeed brings linked inboxes back for everyone. This feature came back for Windows Insiders last week, but now non-Insiders should have access to it once again.
Original Story: Outlook Mail and Calendar has received its third update this week, bringing along a minor version bump and no outwardly-noticeable changes. It's likely that this update simply addresses some bugs and performance improvements, further polishing the app up.
To recap, earlier this week, Outlook did pick up a fairly nice update that brought a portrait week view for mobile devices, as well as full screen reading for phablets and some other goodies. The other update, coming a day later, came without any user-facing changes — just like this one.
If you'd like to check grab the latest update, which bumps the version number up from 17.6509.42252 to 17.6509.64002, be sure to hit up the Windows Store at the link below. And let us know in the comments if you spot anything new or notable!
Thanks for the tip, MP3Mike!