Well, if Google switches to Google, they can save up to 50-70% on their enterprise email costs. Presumably they can then do this again, until they are paying a vanishing fraction of a penny on emails costs. No wonder GMail turns a profit.
In other news, the blinding geniuses at Google, whose shoes you are not fit to shine, recently announced a compression algorithm that uses MapReduce on BigTable running in The Cloud (TM) based on Node.js async javascript running on top of Chrome's V8 running in mobile data centers powered by renewable energy that can compress any data by at least one bit by harnessing the mighty power of buzzwords. Google is preparing a presentation in which they will shortly announce that they will be putting up a torrent containing every file on the internet using this technology.