Google has tried hard for years to get big businesses to switch to Google Apps, later renamed G Suite, its hip alternative to Microsoft Office.

Today, Microsoft still dominates the lucrative market for business productivity tools for a reason: Its product is reliable enough and IT managers find little motivation to gamble with something new, no matter how flashy.

Since Google finally started to  listen to its business customers and got serious about developing features for major enterprises two years ago, the number of organizations paying for G Suite has doubled to more than 4 million.

Most of those customers are small and medium-sized companies, but some big names have signed on too. Verizon Communications Inc, Nielsen Holdings Plc and Colgate-Palmolive Co alone have brought about 250,000 workers to G Suite over the past 15 months, according to the companies.

G Suite may never be an Office killer but consider this: there are people who have gone through their entire college with G Suite and now have to learn Office and they don’t like it.  If Microsoft is worried, it is not saying.