ContactsCalendarSync provides a wireless, automatic, bi-directional synchronization of your Exchange contacts and appointments with your G1 phone.
System requirements for Exchange Server (for administrators): ContactsSync only works with Microsoft Exchange Server 2007. The Exchange Server should have Exchange Web Services enabled and accessible from internet. It is preferable, but not necessary, to have Autodiscover service properly configured and available through internet.
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In most cases, this means that ContactsCalendarSync™ cannot automatically identify your Exchange Web services address. Please choose the advanced setup and manually configure the Exchange Web services address.
Ask your Exchange Server administrator to give you the address
for your Exchange Server's
Web services.
For example, the Exchange Web services address may look like the following:
https://domain.com/EWS/Exchange.asmx.
Please do not confuse the Exchange Web services address with Outlook Web Access; they are different.
Try to open the Exchange Web services address from a secure computer outside of your corporate network. After the entering your user name and the password of your Exchange email account, you will see something like this: