The big requirements for enterprise use are: single-sign on, compliance with regulations (e.g. a multinational company needs to know that you are in compliance

The big requirements for enterprise use are: single-sign on, compliance with regulations (e.g. a multinational company needs to know that you are in compliance with the laws around data retention, data locale, etc. for their own data, in every country that it operates in), and API support for eDiscovery.