Lumia 1520 won't display more than 2 weeks prior history of calendar events. How do I change this?

[WPCentral Question]

I run a moving service and often need to quickly refer to previously scheduled project details while I am remote and mobile with only my phone available to look things up for a client. I am using Outlook.com for my personal calendar and Office 365 for my work calendar. All calendar history is on the server and displays on my Outlook desktop application but only 2 weeks of previous history ever display on the phone.

 

[bozza72]

I think that's the way it is however ALL past calendar events are kept if you look at your outlook calendar online