Microsoft has pushed back the opt-out phase for the new enterprise Outlook from April 2026 to March 2027, giving IT administrators an extra 12 months to prepare for migration. The delay is attributed to the need for more time to deliver key features, though the subtext is that new Outlook still lacks critical enterprise functionality — notably limited support for .pst files. Classic Outlook remains supported until at least 2029, and admins will receive at least 12 months' notice before the eventual cutover stage, after which users won't be able to revert to classic Outlook.
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