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Microsoft has released a public preview of Exchange 2019, the on-premises email server software the company will start selling later this year.
First promised in September 2017, when Microsoft announced that sneak peeks of perpetual versions of the Office applications - Word, Excel, Outlook and the like - and Office-centric servers would land in the middle of the following year, Exchange 2019 is set to launch sometime this fall.
Microsoft has already issued previews for Office 2019 for Windows and the Mac, although both betas have been aimed at commercial customers, not consumers.