Here is the latest response from RIM.
Workaround
Please follow the appropriate steps below to setup Calendar, and or Contacts synchronization for a rogers.com or btinternet.com account:
To add a rogers.com or btinternet.com Calendar account:
On the Home Screen, swipe down from the top bezel.
Click on Accounts.
Click on Add New Account.
Click on Email, Calendar and Contacts.
Click on Advanced Setup.
Scroll down and click on CalDAV.
On the Account Integration screen, the Description field is optional, but can be filled in for clarity.
Enter the full email address in the Username and Email Address fields.
Enter the password in the Password field. Use the Show Password checkbox to ensure it is correct.
In the Server Address field, enter caldav.calendar.yahoo.com.
Sync Interval can be changed with these values : 15 Minutes , 30 Minutes , 1 Hour , 2 Hours , 4 Hours , 24 Hours , or Manual . The default is 15 Minutes.
Click Save to finish.
To add a rogers.com or btinternet.com Address book account:
On the Home Screen, swipe down from the top bezel.
Click on Add New Account.
Click on Email, Calendar and Contacts.
Click on Advanced Setup.
Scroll down and click on CardDAV.
On the Account Integration screen, the Description field is optional, but can be filled in for clarity.
Enter the full email address in the Username and Email Address fields.
Enter the password in the Password field. Use the Show Password checkbox to ensure it is correct.
In the Server Address field, enter carddav.address.yahoo.com.
Sync Interval can be changed with these values : 15 Minutes , 30 Minutes , 1 Hour , 2 Hours , 4 Hours , 24 Hours , or Manual . The default is 15 Minutes.
Click Save to finish.
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Additional Information
The steps contained in this article may be useful in setting up other ISP email accounts that use the yahoo.com service to provide Calendar and Address book functionality.
