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Itzik WinogradItzik Winograd 

SSO from saleforce to 365 - Must all 365-domain-users use SSO?!

Hi guys

We are implementing SSO from salesforce to 365. Most of our users will log into Salsforce and then to 365, but there is a group of workers that do not have SF user and needs to log in to 365 with thier 365 username and password.
The thing is, when enabled on the 365 side, the SSO wont let anyone to log in with 365 username and password - once it recogniz the domain name in the 365 usename, it prompts salesforce page with "error: unable to resolve request into a Service Provider".
The developer working on this told me that once SSO allowd and acticvated for a *domain* in 365 side, all the users must log in to 365 using SSO.
It's kind of weird and against my common sense - Is that righ? When SSO anabled on 365 no other way to log in other than from salesforce, using the SSO? Cant a user use his 365 username and password to log into 365?
Your kind answer will be highly appreciated.
Thanks!