iOS and Mac fans heavily lamented Google’s acquisition of the popular Sparrow app last year, for the first move made under the new ownership was to discontinue any further support for those particular versions of the app. Such was the height of the regard in which Sparrow was held that nowadays, near enough every new mail app is immediately compared with Sparrow. Thus, it would seem a matter of formality that we’d pit Mailbird, a new, Windows-only Gmail app, against the old favorite. But aside from the fact that email power users refer back to Sparrow as a matter of habit, Mailbird, which is currently in public beta, bears a number of striking similarities to an app which strongly influenced the way we deal emails in the modern day.