36 Chapter 3 Manually Configuring Devices
Important: When you configure a device to sync with Exchange, all existing calendar
and contact information on the device is overwritten. Additionally, iTunes no longer
sync contacts and calendars with your desktop computer. You can still sync your device
wirelessly with MobileMe services.
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.
Installing Identities and Root Certificates
If you don’t distribute certificates using profiles, your users can install them manually by
using the device to download them from a website, or by opening an attachment in an
email message. The device recognizes certificates with the following MIME types and
file extensions:
Âapplication/x-pkcs12, .p12, .pfx
Âapplication/x-x509-ca-cert, .cer, .crt, .der
Identities consist of a x.509 certificate and a private key that is used to identify the
users to a service. iPhone and iPod touch supports importing P12 files that contain
exactly one identity. When the identify is installed, the user is prompted for the
passphrase that protects it.
Root certificates are self-signed anchors for X.509 certificate chain evaluations.
These are used by all x.509 certificate chain evaluations made by Safari, Mail, VPN,
and other applications.
You don’t need to add root certificates that are included on the device by Apple.
To view a list of the preinstalled system roots, see the Apple Support article at
http://support.apple.com/kb/HT2185.