Setting Up Free Busy Interop with Exchange 2010

 - This article is a Work in Progress, and may be unfinished or missing sections.

Note:

• These instructions assume that MS Exchange 2010 and Zimbra Collaboration Suite have been installed using the "DEFAULT" configurations. Modify wherever necessary according to your target system’s configurations/settings.
• MS Exchange 2010 System obtains Free/Busy information by using Availability Service instead of Public Folder which is used by Exchange 2003 (The Availability Service obtains the user’s Free/Busy information from its mailbox directly). However Zimbra Collaboration Suite’s interoperability with MS Exchange System is based on the “legacyExchangeDN” attribute which assumes that the Free/Busy information is published into the public folder using WebDAV. If your MS Exchange 2010 System does not have a Free/Busy folder then you can create a new one using the following Exchange 2010 Management Shell (EMS) Command:

[PS] C:\>New-Publicfolder -name "EX:/o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)" –path 
"\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY"

• You also need to ensure that the Exchange 2010 CAS server is forwarding WebDAV service requests to the backend Exchange 2010 Mailbox server.

Troubleshooting

See http://wiki.zimbra.com/index.php?title=Troubleshooting_Exchange_Freebusy_Interop