Microsoft outlook updating cached headers
Your original layout settings are remembered when switching between landscape and portrait mode so you don’t have to manually resize all the Panes again.The new Light Bulb icon in the Ribbon with “Tell me what you want to do…” is a lot more than just a replacement of the the Help Question Mark icon.
When you switch your tablet into portrait mode, Outlook will show the message at almost full width of your device to optimize the reading experience.
Outlook 2016 also still offers support for the the RPC over HTTP Exchange connectivity support for backwards compatibility with Exchange 2010.
For more information see: Introducing Outlook Connectivity with MAPI over HTTPThe major user interface redesign of Outlook 2013 originally had quite a large message header.
Clicking on the “Get Help” link will open the regular Help viewer and the “Smart Lookup” link will open an “Insights” pane in Outlook and performs a web search with Bing.
Clicking on the Attach File icon will now open a menu instead of a browser dialog to attach a file.