On the mobile device, tap Start, tap Programs, and then tap Active Sync.

Tap Menu, tap Add Server Source, and then enter the mobile device address for your company’s data. See URLs for Microsoft Online Services for the list of valid addresses.

Select the This server requires an encrypted (SSL) connection check box, and then tap Next.

In User name, enter your Microsoft Online Services e-mail address. In Password, enter your password, select Save Password, and then tap Next. Leave the domain box blank.

Select the check boxes for the types of data you want to synchronize, and then tap Finish.

Your mobile device starts communicating with Microsoft Online Services.

To delete an existing relationship with Exchange Server