Free/busy information period Free/busy information requests to an Exchange 2007 organization from an Exchange 2013 organization may fail due to a mismatch in the requested free/busy information period. By default, Exchange 2007 accepts availability requests for 42 days of free/busy information and Exchange 2013 may request 62 days of free/busy information. If the request exceeds the default 42 limit imposed by Exchange 2007, the request will fail.
Follow the steps below to configure your Exchange 2007 CAS servers to accept longer period free/busy information requests:

On all your Exchange 2007 CAS servers, open the following file with a text editor such as Notepad: V14ClientAccessExchWebEWSweb.config

Before you make any changes to the web.config file, make a copy of the file and store it in a safe location.
Locate the appSettings section in the web.config file.
Add a new key “” and save the web.config file.
The maximumQueryIntervalDays value isn’t present by default. When this value isn’t present, Exchange 2007 uses the default interval of 42 days.
Stop and restart the Microsoft Internet Information Services (IIS) on all the Exchange 2007 CAS servers.

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