التفعيل 4 د· آخر تحديث 2026-10-16
كيفية تفعيل Office 2021 (أو 2019) بمفتاح منتج
الربط على setup.office.com والتفعيل داخل التطبيق وشرح أخطاء "هذا المفتاح مستخدم بالفعل" الشائعة.
Office activation depends on the key type you bought. There are two flows — and mixing them up is the #1 cause of activation problems.
Flow A: Keys that bind to a Microsoft account (setup.office.com)
- •Go to setup.office.com and sign in with a Microsoft account
- •Enter the 25-character key — it binds permanently to that account
- •Office downloads/activates automatically; reinstalls later only need the account login, not the key
- •The key is consumed once — it can never be used on a different account
Flow B: In-app / MAK keys
- •Open Word → File → Account → Change License / Activate Product
- •Enter the key → activate online
- •MAK keys on a closed network can use phone activation (same slui 4 flow as Windows)
Common problems
| Symptom | Cause | Fix |
|---|---|---|
| "Key already used" | Bind-type key redeemed on a different Microsoft account | Sign in with the account it was bound to — the key cannot move |
| "This key isn't for this product" | Edition mismatch (e.g., ProPlus key vs Home&Business installer) | Install the matching edition — check the key in our PID Checker |
| Unlicensed product banner after install | Multiple Office versions installed side-by-side | Remove the old version, run online repair |
| Activation works, then reverts | Subscription check on a 365 install, or leftover trial license | osa /fix or remove the trial license in Account → Manage Licenses |
Before you redeem
Decide which Microsoft account should own the key BEFORE entering it at setup.office.com — the binding is permanent and Microsoft support cannot move it.