Office365 – Exchange 2003 Free/Busy Coexistence Issues

So, recently we worked an issue for a customer that we struggled with for a long time: Exchange 2003 users couldn’t see Free/Busy information for users who had been moved to Office365.  This should work and is fully supported as part of Office365 migration and coexistence. Background Exchange 2003 relies upon Free/Busy in Public Folders.  So,…