In Exchange 2007 the Free/Busy information is stored and accessed in the respective mailboxes, as compared to Exchange 2003, where the Free/Busy is accessed from Public folders.
Public folder distribution is in-efficient because of the fact that it is not up to date in certain circumstances. In Exchange 2007 the Public Folders are De-emphasized and Client Access Server (CAS) role takes most of the functions provided by Public Folder like:
- Access to a Exchange mailbox Free/Busy information.
- Offline Address Book (OAB) distribution.
- Outlook Web Access (OWA)
- Outlook Anywhere (previously RPC over HTTP) etc
and in addition to the above the CAS Exchange role provides Auto-Discover service and Availability service.
Availability service:
Availability service is the web-based Free/Busy access provided by CAS role. When a user creates a meeting request for his manager (say), the user's exchange server contacts the Availability service URL which opens the Manager's mailbox and get's the free/busy information to complete the process.
Troubleshooting:
To troubleshoot the availability information, use the
Test-OutlookWebservices cmdlet for scenarios like free/busy information of self, user on same server, user on server in different site etc. You can user Verbose parameter to check the process carried out by Exchange server.
Example: Test-OutlookWebServices -Identity user1@domain.com -targetaddress user2@domain.com
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