This info helps if you're looking to modify the amount of data used by your corporate email account.
From a Home screen, navigate: Apps icon > Settings > Accounts & sync.
If Settings is unavailable, tap the Dropdown menu (located in the upper-left) then select Alphabetical. If still unavailable, refer to Manage App Icons.
Tap Exchange Activesync for HTC Sense.
Tap General settings.
From the MAIL SETTINGS section, select then configure the following: