This is the most secure and permanent method. It links your license directly to your Microsoft account, making future reinstalls much easier. : Go to the Official Office Setup Page.
: Log in with your Microsoft account (or create a new one).
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Open any Office application (e.g., Word) and navigate to .
: Input your 25-character product key (format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). This is the most secure and permanent method
This guide explores the official and technical methods to activate your software securely in 2026. Method 1: Activation via Microsoft Account (Recommended)
Enter your valid product key and follow the prompts to complete the process online. Method 3: Telephone Activation : Log in with your Microsoft account (or create a new one)
Run slui.exe 4 in the Windows command line to launch the wizard manually if it doesn't appear.
Provide the (shown on your screen) to the automated system to receive a Confirmation ID . Enter the Confirmation ID into the wizard to finish. Method 4: Technical Activation via CMD (Volume Licenses)
: Once the key is redeemed, download the installer from your Microsoft Services & Subscriptions page. After installation, open any Office app and sign in with the same account to complete activation. Method 2: Activation Using a Product Key Directly