When activating certain versions of Microsoft Office (especially older volume-licensed or phone-activation flows), you may encounter two codes: an Installation ID (IID) and a Confirmation ID (CID). This post explains what each is, why they exist, and a clear step‑by‑step for obtaining and using them to activate Office via telephone.
Once the Activation Wizard runs, if online activation fails or you choose offline activation, you will see a screen labeled “Activate by phone” or “Offline Activation.”
On this screen, you will see a block of numbers labeled “Installation ID” or “ID de instalación.” It will be broken into 9 blocks of 6 digits (54 digits total). microsoft office installation id to confirmation id
Example Installation ID:
123456 789012 345678 901234 567890 123456 789012 345678 901234
Crucial Warning: Write this number down exactly as shown. A single digit error will generate a wrong Confirmation ID. Take a screenshot or use copy-paste if the system allows it. How Microsoft Office Installation ID and Confirmation ID
The Installation ID is a unique, machine-specific code generated by Microsoft Office during the activation process. It is usually a long string of numbers (often 54 digits divided into 9 groups of 6 numbers).
Unlike your Product Key, which remains constant, the Installation ID changes based on the hardware of your computer. It acts as a digital fingerprint that tells Microsoft's activation servers exactly which computer is trying to use the software. Go to the Microsoft Support/Activation portal relevant to
If you are an IT administrator or cannot use the phone, Microsoft sometimes offers an online "Get Support" portal for Volume Licensing: