# Windows 11 launch and TPM requirement

> A TPM 2.0 requirement prompted compatibility questions ahead of Windows 11.

- Owner: Microsoft
- Kind: App & software
- Sector: Technology
- Seed date: 2021-10-05
- Milestone date: 2021-10-05
- Date basis: Documented milestone; not a measured attention peak.
- Spread Score: 36 (Niche), v1.3
- Mechanics: Controversy, Pairing

## Summary

Microsoft announced Windows 11 and an eligibility checker. Compatibility questions followed; Microsoft withdrew and revised the checker. Windows 11 began rolling out in October.

## Timeline

- 2021-06-24 — Microsoft (Open web) — Microsoft announced Windows 11 and offered a PC Health Check app for upgrade eligibility.
- 2021-06-24 — Microsoft Q&A user (Open web) — A user asked why PC Health Check rejected their PC.
- 2021-06-24 — Tom’s Hardware (Press) — Tom’s Hardware reported that enabling firmware TPM made its tested PC eligible.

The full timeline, metrics and sources are on the case page, or via the Pro API (https://howitspread.com/mcp#api).

Canonical URL: https://howitspread.com/cases/windows-11-launch-2021

Cite as: How It Spread (2026). “Windows 11 launch and TPM requirement.” Case HIS-01800. Spread Score v1.3: 36/100. Updated 2026-10-28. https://howitspread.com/id/HIS-01800