According to the original leak, Microsoft officials were not intending to replace the legacy Win32 Outlook client with the new Outlook until some much later date. Microsoft currently has different versions of Outlook for Windows, Mac, the Web, iOS, and Android devices. The mobile versions are based on the Acompli technology it acquired. Microsoft refers to all of these variants as plain-old “Outlook.” The new One Outlook – which also is expected to be branded as “Outlook” once it’s available – will work on the Windows Desktop (Win32/UWP; Intel and Arm), on the Web, and the macOS Desktop. Update (May 9): Microsoft officials are warning admins about the leaked version of the new Outlook, cautioning that it is missing some of the features and functionality which will be part of the official beta release of the product. Officials said the beta will be available “in the coming weeks.”
