1. Aggregregate Newsfeed

The existing aggregated newsfeed feature will be read-only in SharePoint 2019. Both the tile in the app launcher and the option to implement the newsfeed capability will also be removed from this version forward.

2. Custom Help

The existing help engine in SharePoint will also be removed in the future. In this edition, Microsoft legacy on-premises SharePoint help engine, which is based on help collections being installed in the on-premises farm, will be updated and will synchronize content with Office 365.

3. SharePoint Designer 2013

Microsoft SharePoint Designer (SPD), formerly known as Microsoft Office SharePoint Designer, is a discontinued HTML editor freeware for creating or modifying Microsoft SharePoint sites, workflows and web pages. SharePoint Designer 2013 will work with SharePoint Server 2019 Public Preview for the remainder of the client support lifecycle (2026).

4. Multi-Tenancy

As Microsoft continues the push to SharePoint Online, an increasing amount of SharePoint multi-tenancy capabilities are building dependencies on cloud technologies that aren’t available in on-premises environments. The cost and complexity of providing an on-premises alternative has become too expensive, so it will not be available in the SharePoint 2019.

5. Visio Services

Visio Services has two options for rendering Visio diagrams: Microsoft Silverlight-based and PNG-based. Microsoft Silverlight will no longer be supported as of Oct. 12, 2021. This means that Silverlight-based rendering will no longer be supported in SharePoint Server 2019 Public Preview.

6. Code-based sandbox solutions

Support for code-based sandbox solutions will be removed from SharePoint 2019. Sandbox solutions are customization packages that can be used to deploy customizations to SharePoint on the site collection level. They have already been removed from SharePoint 2013 and SharePoint Online. Microsoft suggests users look at SharePoint add-ins as an alternative.