Google adds support for Microsoft Office, Facebook at Work, Slack and others to its single sign-on solution
Google doesn't just offer its own web-based productivity apps, but it also offers a service for business users who want to use Google as an identity provider for accessing …
Context & Ripple Effects
This lands five months after Google Apps For Work crossed 2 million paid users and began vetting third-party apps — evidence Google was already building for mixed-stack enterprises rather than all-Google shops. The new single sign-on support extends that logic to identity itself: an IT department can keep running Microsoft Office, Slack, or Facebook at Work while Google holds the keys.
Identity is the stickiest layer of the stack, and the related coverage shows Google systematically claiming it: within months it named Okta its preferred identity partner for enterprise customers (the Okta partnership), and by 2018 it had spun the same G Suite identity technology out as a standalone cloud identity service for developers.
First-order effects
- Enterprises running mixed toolchains can now provision and deprovision access to Office, Slack, and Facebook at Work through Google instead of managing separate credentials per vendor.
- Slack, Facebook at Work, and Microsoft gain enterprise adoptability inside Google-managed organizations — their products become easier to buy precisely because Google no longer gates them behind its own login.
Second-order effects
- Dedicated identity vendors like Okta face a platform vendor moving onto their turf — though Google's subsequent choice of Okta as preferred partner suggests coexistence rather than displacement, with Google absorbing federation work and Okta keeping the broader directory role.
- Microsoft, whose Azure-side identity business depends on Office anchoring the login, faces pressure to make its own identity layer equally hospitable to non-Microsoft apps — reciprocity becomes table stakes.
Third-order effects
- If the pattern holds, the productivity suite and the identity provider fully decouple: whoever controls authentication controls the enterprise relationship even when rivals' apps do the daily work — which is exactly the path Google took by productizing Cloud Identity separately from G Suite.
- Suite vendors converge on interoperability as a competitive weapon, mirroring what Google later did on the document side by letting Dropbox users edit Docs and Sheets in place — the moat shifts from locking users into your apps to being the layer every app must pass through.
The trend: Enterprise identity is becoming a platform-agnostic control plane, with suite vendors competing to be the login layer regardless of whose productivity apps run on top.