Google OpenID and Azure ACS - Time to update!

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If you've been around Azure for some time you'll know ACS is one of the foundation services that provides an open authentication platform that can use various identity providers as a source.

Traditionally for Google-based identities, ACS utilised OpenID which Google is retiring in favour of an OAuth 2.0 implementation ("OpenID Connect").

Microsoft has published guidance on what steps you will need to take if you have Google configured as an identity source today so that your application(s) continue to work after June 1, 2015.

If you are unsure if it affects you it's worth checking how your ACS service is configured!