Well, my answer was as follow:
... about cost benefit studies there is a post in Zdnet to get some idea how you can show pricing reductions by using SaaS in companies.
Moreover, there is a company (Mailtrust, http://www.mailtrust.com/) that offers a solution to use Exchange and Hotmail together and so you have another argument to don't change to Gmail.
Here is a interesting post about Mailtrust:
Even more, Microsoft recently announced LiveMesh (https://www.mesh.com/Welcome/Welcome.aspx) to compete with Google in the cloud-computing field, here is a interesting post about this:
This is not a defense of MS Exchange, but if you don't have investment and cost contrains you could keep your Exchange in peace, if no, you have a economical alternative with Google Apps.
At this point, you can ask yourself what happens with privacy and SLA statements, I think you have 3 variables to evaluate: cost, privacy and service level.
- Ricardo Seguel P.