Compare the exact edition and support lifecycle before buying a one-time-purchase Office license. A version year alone does not identify the included apps, license channel or operating-system support.
Version and license are different questions
Office 2024 and Office 2021 are version-specific purchases. Microsoft 365 is a subscription with separate services and feature entitlements. Do not assume a perpetual Office license includes Copilot or Microsoft 365 cloud benefits. See Microsoft’s comparison.
Check support before choosing an older release
Office 2021 and Office LTSC 2021 reached end of support on October 13, 2026. An existing perpetual license does not automatically expire at that point, but Microsoft no longer provides the ordinary security and support servicing for that release. See Microsoft’s lifecycle notice.
Choose the edition, not just the year
Home & Business and LTSC Professional Plus are different offers. LTSC 2024 is available to organizations through volume licensing; possession of a MAK key does not by itself establish entitlement. Publisher is not included with Office LTSC 2024. Review Microsoft’s LTSC overview and confirm the edition, apps, platform, device allowance and license documentation for the exact product.
Before ordering
Check current operating-system requirements, add-in compatibility, Microsoft-account requirements and the license channel. Future major versions require their own entitlement. For our current availability, use the catalog; read the Refund Policy and ask support@softwareinstore.com about missing details.