OneNote is now bundled with Office, though since Spring 2014 this app has been free on all platforms. Microsoft Office and Microsoft 365 give you access to the programs you need to work, play, and stay connected.
Outlook has support for Message Preview (seeing the first line of an email in the list of messages), and Online Archive, a feature of Office 365 Enterprise or Exchange.
Saving to a QuickTime movie has been chopped.
PowerPoint gets an improved Presenter View, support for PowerPoint 2013 transitions, and an enhanced animation pane for managing animations.
Word gets a new Design tab for applying themes and styles, and an improved navigation pane (replacing Document Map).
The formula builder has been improved, and print to PDF has been added. The only really obvious difference between the two is that Word 2019 is missing the Dictate icon, but I am guessing that this is because it is running on a. Most Excel 2013 functions are now supported.
Excel has added support for the Analysis Toolpak (a collection of data analysis wizards), PivotTable slicers (buttons for filtering data in a PivotTable report), a Recommended Charts wizard, and an Equation Editor (replacing Office 2011's ancient and separate Microsoft Equation Editor).