There's a lot more to it than that sentence makes it seem. Even if they didn't go with Google Apps, they'd switch off their legacy Exchange eventually, which c

There's a lot more to it than that sentence makes it seem. Even if they didn't go with Google Apps, they'd switch off their legacy Exchange eventually, which could cost hundreds of thousands of dollars. You can't just download and install the newer version, the way you'd upgrade from OS X 10.6 to OX X 10.7. You have to go through a migration process. And you want it to go seamlessly, including a temporary coexistence mode, so you really should hire specialized consultants. For example, here's reference material on migrating from Exchange 2003 to 2010: http://technet.microsoft.com/en-us/library/dd638130(v=exchg.141).aspx http://technet.microsoft.com/en-us/library/dd638130(v=exchg.... MS Exchange is dated software, coming out with new versions regularly: 2003, 2007, 2010, 2013 (not yet production ready), and typically organizations keep whatever version they initially bought (say, 2003) rather than go through the pain of upgrading. So even if you were to migrate from Exchange 2003 to 2010 it could cost hundreds of thousands of dollars for consulting services in the process. And you're doing all that for software that was released in 2010, probably built in 2008-2010, so it's literally 5 years old software you're installing in 2013, that's only going to start getting more out of date. That's one of the advantages of Google Apps and SaaS: once you go with Google Apps, you'll never have to upgrade, and you'll always have the most up-to-date version.