And back working again , must have been a glitch in the matrix I guess.

Not sure really, I don't think the logons are used else where, well none I know of anyway.

I would suspect SSO is for myspark. - this is not officially confirmed though, i will need to check. 

the two very much intermix with the new platform, just as it should.

Ah true that , yup can go between myspark and web mail fine.