Why doesn't my iPhone keep all of my mail?

I have 2 mail accounts on my iPhone; my Gmail and my exchange. My gmail account keeps emails from way back… I'm talking 2 years and more unless of course I delete them. However my exchange email account will only keep 20 emails and then will just auto delete the one at the bottom. It doesn't go into the delete box, it just vanishes! I have my settings set to manual fetch and have also set the email settings to unlimited emails for both accounts so why would my exchange email be doing this?

Some help would be much appreciated.

Because it's an iPhone, you'd never have this problem with a Samsung

Because it's a film

To ensure we're on the same page I will post the steps. I guess you should delete your exchange email from iPhone and re set it up.

Go to Settings>Mail, Contacts, Calendars>Outlook>Mail Days to Sync = No limit

Also Settings>Mail, Contacts, Calendars>Fetch New Data>Push = off

& Settings>Mail, Contacts, Calendars>Fetch New Data>Outlook>Manual

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