What is the transition plan from old Edge to Chromium Edge?

josh_assad Keep in mind businesses will usually wait 6-12 months before releasing a Windows 10 update to their employee's. Assuming New Edge gets embedded with a Windows 10 release update, I would expect to still have to support the old Edge for at minimum of 12 month, and probably 24 months as businesses will have to assess things. Also keep in mind some computers cannot upgrade to the latest editions of Windows 10 (some are still on old builds since their hardware doesn't support newer builds of Windows 10), so those people will need to be supported until they are no longer using their outdated computers.

So you may be supporting several versions for while still even after release. Hopefully with Chromium the management of this will be very small. Since they share the same engine as Google Chrome, I would think that building a web site for Chrome means building it for New Edge at the same time, with little to no code changes. But old edge will still be around for awhile.