From Destination ZD Net:
Exchange Server 2019 adds updated search (powered by Bing) and updated calendaring features, including “Do Not Forward” and “Simplified Calendar Sharing.”
Skype for Business Server 2019 adds improvements around hybrid support, plus new features including Cloud Voicemail, Cloud Org Auto Attendant, Cloud Call Data Connector and Streamlined Migration to Teams.
SharePoint Server 2019 will bring a more “modern” interface, improved performance and scale, simplified management and deeper SharePoint Framework integration, as Microsoft execs disclosed earlier this year.
Project Server 2019, which has collaboration capabilities provided by SharePoint Server 2019, adds performance and scalability improvements, updated reporting, and support for an expanded set of programming interfaces. Update (July 26): This preview actually went live at the same time as the SharePoint Server 2019 one, since Project Server is integrated with the SharePoint bits, even though it’s licensed separately, a Microsoft spokesperson told me today.(read more)