Hi Can the Exchange 2003 users , see the free busy (calendar) information of Exchange 2010 Mailbox Can the Exchange 2010 users , see the free busy (calendar) information of Exchange 2003 Mailbox Regards

Hi, Yes, that should be available with no configuration if the exchange servers are installed in the same organization. Leif

It is not working in our coexistence environment (exchange 2003 and exchange 2010) What troubleshooting steps can be done , so that Exchange 2003 user -- can see free busy information of a exchange 2010 user Exchange 2010 user --- can see free busy information of a exchange 2003 user

Hi Exchangeskumar, Any updates?Frank Wang TechNet Community Support