You might want to change from using availability service to classic public folder usage for accessing and storing free/busy information.
What you have to consider if using free/busy information with public folders in a pure Exchange 2010 environment after installing Exchange without a public folder store?
Continue reading GALsync Special - Part 7:: Free Busy with Exchange 2010
What happens behind the scenes when synchronizing free/busy data between multiple Exchange organizations using GALsync?
When synchronizing different mail organizations GALsync reads the free/busy information of selected user objects in source and stores them in target as free/busy information related to the synchronized contact object.
GALsync does not sync free/busy every time it is modified in source. You might want to export free/busy times in a time window of minimal 5 minutes.
Continue reading GALsync Special - Part 2 :: Free Busy
