I’m actually surprised that Slack hasn’t tried their hand at an email service to combat this. Yes o365 is more than email but that’s their foot in the door. If you cut off that sales vector you make MS have to compete on the merits of their add-on services and they don’t hold up. Notion is a OneNote and Sharepoint destroyers. Zoom and Slack are better than Teams and S4B. Okta and Auth0 are better than ADFS.
Do you know Okta well? I've been looking for product comparisons but the best I came up with was Okta's "Why Choose Okta vs. ADFS?" [1]
And that's just sales talk. It says ADFS needs multiple servers, which it doesn't. At least it depends on your deployment model. And whether AD running on another server constitutes "multiple servers" (of course just as true for Okta).
It also says Okta runs in the cloud. The implication is that ADFS doesnt. Well, like anything, it does.
The remainder talks about low TCO, deployment speed, simplifying AD complexity, and the cloud. All of which are rather subjective.
I say all of this having done some very complex ADFS deployments - at the extreme using Chip & PIN authN, and authR from client workstations assumed to be compromised.
So given the above I'd love to find a compelling and unbiased comparison. Including featureset.
> I’m actually surprised that Slack hasn’t tried their hand at an email service to combat this.
This either shows that Slack's "email is dead" marketing strategy was very effective (did an important job during a specific period of early growth and they have now moved on) or very ineffective (their main proposition completely passed you by).
