Getting an error when trying to install a Transport Agent that is built with Exchange 2010 pre SP 1 binaries on Exchange 2010 SP 1?

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Note:This issue is now addressed in Exchange 2010 SP3 RU2 and it will be addressed for Exchange 2013 in the next cumulative update.

Have you tried install Installing a Transport Agent that is built with Exchange 2010 pre SP 1 binaries on Exchange 2010 SP 1? If not try it and you will get a error:

The TransportAgentFactory type "YourNamespace.YourAgentFactory" doesn't exist. The TransportAgentFactory type must be the Microsoft .NET class type of the transport agent factory.
Parameter name: TransportAgentFactory
+ CategoryInfo : InvalidArgument: (:) [Install-TransportAgent], ArgumentException
+ FullyQualifiedErrorId : 6F5E297B,Microsoft.Exchange.Management.AgentTasks.InstallTransportAgent

This error is happening because while installing when the agent assembly is loaded, we check for all the Types associated with it and that where it fails as it is looking for the old build of the Microsoft.Exchange.Data.Common.dll and Microsoft.Exchange.Data.Transport.dll which is not there on the system. I tried copying the Microsoft.Exchange.Data.Common.dll and Microsoft.Exchange.Data.Transport.dll to the folder where the agent is installed and then I get a different error:

There is no known TransportAgentFactory interface implemented by the specified TransportAgentFactory "YourNamespace.YourAgentFactory".
Parameter name: TransportAgentFactory
+ CategoryInfo : InvalidArgument: (:) [Install-TransportAgent], ArgumentException
+ FullyQualifiedErrorId : 7804297B,Microsoft.Exchange.Management.AgentTasks.InstallTransportAgent

The resolution is simple, recompile the Agent after adding references to the Microsoft.Exchange.Data.Common.dll and Microsoft.Exchange.Data.Transport.dll from the SP 1 build(14.1.214.0) and then installing the latest build.

Surprisingly an Agent compiled with Exchange 2007 binaries installs without an issue! Why?

This happens because we have a redirection policy in place for Exchange 2007. If you look into the GAC, there are two files named policy.8.0.Microsoft.Exchange.Data.Common and policy.8.0.Microsoft.Exchange.Data.Transport that redirect all old assembly(Exchange 2007) references to the latest build(14.1.214.0) and it just works. Unfortunately, we do not have one for the pre SP 1 and that the reason it fails.

The only solution as of now is to recompile the Transport Agent with the latest binaries from Exchange 2010 SP 1. The issue is being worked upon and we might have a FIX in the near future!

Enjoy!