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Summary
When Microsoft Exchange mail is configured on iPhone or iPod
touch, the default setting for "Mail days to sync" is set to 3
days.

Products Affected
iPhone, iPod touch
To increase or decrease the amount of email messages
displayed in your Microsoft Exchange mail accounts (Inbox,
personal folders, Sent, etc.) change the "Mail days to sync" for
the account.
From the Home screen tap Settings > Mail, Contacts,
Calendars. Select your Microsoft Exchange account and
then tap Mail days to sync and select the
number of days (No Limit, 1 day, 3 days, 1 week, 2 weeks, or 1
month)