+ 0 Votes Some More Info s31064 5 years ago Here's a little more specific info that applies to Exchange 2007, and 2003 as well I believe. We have several iPhone users (including myself) and have no problems with these settings.1. Before you configure ActiveSync on your mobile device, check ensure that ActiveSync has been enabled for your mailbox. To do this, you must provision and enable the Outlook Mobile Access (OMA) package for your account.2. You can have only 1 ActiveSync email profile configured on your mobile device. You may have multiple POP3 or IMAP4 profiles configured at the same time.3. When you configure your iPhone to sync with Exchange, all existing calendar and contact information on your iPhone is overwritten. Also, iTunes no longer syncs your contacts and calendars with your desktop computer. NOTE: If you do RESET iTunes to sync with your PC (presumably Outlook), you will wind up with two of everything.Configure ActiveSync Access on Your iPhoneStep 1) Tap SettingsStep 2) Tap Mail, Contacts, CalendarsStep 3) Tap Add AccountStep 4) Tap on Microsoft ExchangeStep 5) Enter your 'Exchange email address' in the Email fieldStep 6) Enter your 'owa.server.com' name in the Server fieldStep 7) Enter your Outlook/Outlook Web Access (OWA) 'username', in the Username: fieldIf your 'username' contains an '@', (firstname.lastname@example.org), enter username inthe Username field (for example, email@example.com)If your 'username' contains an '@', (dmaloney@corpx), enter 'username' in the Usernamefield (for example, dmaloney@corpx)Your iPhone and some Apple documentation will direct you to enter your 'Username' inthe format of 'domain\username'. This is unnecessary when your username contains the@ symbol.Step Enter your 'Exchange email password' in the Password fieldStep 9) Enter Exchange 2007 (or whatever applies to your company) in the Description fieldStep 10) Ensure the Use SSL field is set to ONStep 11) To change how many day's worth of data is synced to your device, go to Settings, Mail, Contacts, and Calendars. The default setting is three days.