Spanish banking giant BBVA is switching its 110,000 staff to use Google’s range of enterprise software.
The deal is the biggest that the search giant has signed with one company for its cloud-computing services, where software is offered as a service via the internet.
The bank told the BBC it would use Google’s tools only for internal communication.
But the deal can be seen as a breakthrough in corporate adoption.
Banking – with its high security needs and strict regulations – was always considered to be one of the last industries to accept cloud-computing.
BBVA’s director of innovation, Carmen Herranz, stressed that all customer data and other key banking systems would “stay in our own data centres” and be completely separate from the cloud solution.
The bank would use Google applications like email, calendar, docs, chat, video conferencing and other collaboration tools to “achieve a cultural change” and get “the whole company working together” across the 26 countries where BBVA is based.