Receiving error event 4002 from MSExchange Availability on Exchange 2010

During upgrade process from Exchange 2007 to Exchange 2010 I was experiencing error event 4002 from Application log on Exchange 2010 servers. Here is a part of the error :

Process 5436: ProxyWebRequest IntraSite from S-1-1-0 to https://casserver2007.local.domain/EWS/Exchange.asmx failed. Caller SIDs: NetworkCredentials. The exception returned is Microsoft.Exchange.InfoWorker.Common.Availability.ProxyWebRequestProcessingException: System.Web.Services.Protocols.SoapException: Microsoft.Exchange.InfoWorker.Common.Availability.TimeIntervalTooBigException: The requested time duration specified for FreeBusyViewOptions.TimeWindow is too long. The allowed limit = 42 days; the actual limit = 62 days. ---> The requested time duration specified for FreeBusyViewOptions.TimeWindow is too long. The allowed limit = 42 days; the actual limit = 62 days.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.EndInvoke(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.Proxy.Service.EndGetUserAvailability(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.FreeBusyApplication.EndProxyWebRequest(ProxyWebRequest proxyWebRequest, QueryList queryList, Service service, IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.ProxyWebRequest.EndInvoke(IAsyncResult asyncResult)
at Microsoft.Exchange.InfoWorker.Common.Availability.AsyncWebRequest.EndInvokeWithErrorHandling(). The request information is ProxyWebRequest type = IntraSite, url = https://casserver2007.local.domain/EWS/Exchange.asmx

By default, Exchange 2007 allows availability queries for 42 days, and for Exchange 2010 this limit is 62 days. So, when Exchange 2010 performs a request for a user on Exchange 2007, the request will fail because Exchange 2010 will be requesting for 62 days information, while Exchange 2007 expects maximum for 42 days request. To avoid this issue you can set maximumQueryIntervalDays value in EWS web.config located in exchange 2007 installation folder\ClientAccess\Exchweb\ews . maximumQueryIntervalDays must be added under appsettings section. By default, this value does not exists and Exchange 2007 is using the default interval of 42 days. Here is the sample how appsettings section should look like:

<add key="maximumQueryIntervalDays" value="62" />

After adding this setting, you will have to IISReset, and Exchange 2007 CAS server will accept the new value. This setting helped in my case for the error event 4002 on Exchange 2010 to disappear.


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