Google is all set to give 25GB email box to corporate clients who buy the Google Apps service. The corporates have to sign up for the Google Apps service and pay $50/year for every user using Google Apps.
Along with this the users get access to Google Docs, Google's fast support, Better Security, Better Spam Filtering. There will also be features from Postini, a company Google bought recently!! So we now know, what was Google's cunning plan when buying Postini!! I think Google's main USP (Unique Selling Proposition) here is that they want to advertise this to companies which want to reduce their IT support staff for emails.
The service is supposed to be available from 2008 and Google will also offer Premium Google Apps Service to existing Postini customers.