The Extreme Hardware/Software Compatibility and Recommendation Matrices provides information about the supported and recommended operating-system versions (ExtremeXOS and EOS) for Extreme Networks switches and routers.
We're now publishing the Matrices in a new format that allows you to get updates and corrections as soon as we know about them. Previously, the PDFs and web pages were updated only three or four times per year.
I invite you to try the new Matrices document. You can access it from the Extreme Documentation page (as before) or directly at this URL:
Following up: I've verified that for the A/B/C/D/I and G series products, the latest version of the SecureStack software is always the recommended version. (I was wrong when I said this software was EOS. The software is actually unique for each platform.)
Mike, thanks for your question. I'm looking into this, but I believe that the latest version of EOS, which is currently 08.42.03.0006, is recommended for all platforms. I'll let you know what I find out.