— Editor's Note: This guide originally framed Magento's June 2020 support cutoff as an upcoming deadline. That date has now passed — it's over six years in the rear-view mirror. We've kept the original walkthrough below fully intact (it's still accurate for how the Cart2Cart migration process works) and added the current numbers, terminology changes, and platform context in bold/highlighted sections throughout, plus a new "Where Things Stand in 2026" section and FAQ at the end. Since the release of…