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That exists... It's called "Microsoft Office 2021 Professional" and it's on their website. Very expensive. You can find it (much) cheaper elsewhere.

It's not off-line, not feature-complete, and has support only up to 2026 (no extended support).

Why would microsoft support a one-time fee software forever?

> has only security updates for a long period.

I didn't say "forever", and paying $250 for a suite that will stop getting updates in 3-4 years is not what I had in mind.

The last update for Office XP was in 2004, 3 years after release. They've been pretty consistent with that.

Mainstream support for Office XP ended on July 11, 2006, and extended support ended on July 12, 2011, 10 years after release.