As per the earlier post on deciding what type of E-mail capabilities your MS CRM 2011 Online needs to have, if you have finalized on the Router implementation, then these are the steps to follow:
1. Download the Microsoft Dynamics CRM 2011 for E-mail Router Installing Guide for use with Microsoft Dynamics CRM Online. Here is the link.
2. Download the Microsoft Dynamics CRM 2011 E-mail Router. The exe file is here.
3. Decide on the Server you would want to install. This has to be a proper exposed online server.
4. During installation , there would be some pre requisites that needs to be met. Many a times, there would be an error during this step, wherein , Microsoft Online Services Sign-in assistant 7.2 download will fail. How to recover from this error is illustrated in the post here.
Once installed, we need to configure Email Router using the configuration manager.