This is an interesting story! BBVA abandons their Microsoft Infrastructure and moves to Google Apps (E Mail, Office, Intranet), to increase user productivity and not necessarily to lower cost. Banks tend to be more conservative and it is impressive, that a big player (Spain, South America) undertstood the options (Microsoft, Apple, ZImbra, Google) out there and went for it.
I have worked with different desktop standards and systems in GE Capital (Windows and Linux), Deloitte (Linux and Apple), Cisco Systems (Apple) and now at a bank based on Windows.