Apart from the pricing plans --makes it difficult to invest in uploading all our company secrets if I don't get a clear return--, what about Linux based desktops? Will this be only Mac/Windows centric? Are there single-sign-on options for Google Apps for Work?
Our sign-on process uses a modified form of SRP. (See the draft white paper). It is not a traditional "authentication" process and so can't use other SSOs.