1
No.
As an alternative, you can configure Outlook to let you press Spacebar to navigate/read an entire message thread:
With this enabled, while reading a message in the Reading Pane, press Space repeatedly to scroll through the message, one page at a time.
Could you add a few words on how exactly the space bar is used to this end? Great to know how to turn it on, better to also know how to use it. – HighlandRat – 2015-08-12T16:00:05.283
@High Great suggestion. Answer updated. – I say Reinstate Monica – 2015-08-12T16:37:35.920