My company uses Active Directory for Authentication but CRM Online uses Windows Live ID.  How can I have single sign on if there are 2 different logins.  The answer is quite simple.  Load the CRM Online Outlook client and during the configuration process select the checkbox to save your Windows Live ID username and password.
Save WLID password

The next time you open Outlook you will NOT be prompted for your Windows Live ID and WILL be connected to CRM Online.  This is not true single sign on but from a user perspective appears to be so.  Bear in mind this is accomplished by saving the credentials on the PC.  For more details on how true single sign on can be accomplished between on-premise and cloud based applications I recommend you check out “Geneva”.  More to come on how Geneva can be utilized with CRM Online.

- Eric Boocock