Microsoft has had some sort of Office applications built in within its Windows based platform for the phone since its inception. The earliest phone operating systems from Microsoft have had Outlook integration built in seamlessly — but other apps like mobile versions of Word and Excel have also been available since a long time. The mobile version of PowerPoint was included for the first time as part of the Windows Mobile 5.0 operating system released in May 2005 — that version was primarily a PowerPoint viewer with no editing capabilities.
Learn more about the history of PowerPoint Mobile.

