Background On of the features of the Communications Server product going all the way back to Live Communications Server 2005, is Public IM Connectivity (PIC) . This feature allows you to setup connectivity between Communication Server and three of...

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...