from the Home screen tap Settings then tap Mail Contacts Calendars
tap your current Exchange account
tap Delete Account at the bottom
it’ll take a second to delete and then you’re back at the Accounts page
tap Add Account
tap Exchange
enter the following settings…
Email: [Your Email]
Domain: MAIL
Username: [Your User]
Password: [Your Password]
Description: [Short Description]
tap Next
if you get a message that says: Unable to Verify Certificate tap Accept
next a Server field is revealed enter the following…
Server: exch1.123together.com
tap Next
leave Mail Contacts Calendars set to ON
tap Done
now you’re back at the Accounts page again
tap your Exchange account
tap Mail Days to Sync
tap No Limit
tap the top left button to save/return then tap top left again
once you’re back at the Accounts page scroll to the very bottom and double check that in the Calendars section the Time Zone Support is set to your timezone.
return to the home screen and give your phone 5-10 minutes to sync with the Exchange server and download your mail/contacts/calendars