- You are trying to use the same product key on multiple computers, and you exceed the limit that is specified in the Microsoft Software License Terms. The Microsoft Software License Terms are located in the product installation folder on your computer. For some products, the Terms allow activation on more than one computer. See the Microsoft Software License Terms for more information, including how many computers that the product can be activated on.
- You made significant changes to your computer's hardware, such as installing a new RAM card, a video card, or other hardware.
- You reformatted the hard disk.
|•||Home and Business 1PK – Licensed for 1 Mac (1 User).|
|•||Hme and Business 2PK – Licensed for 1 user to install on 2 Macs.|
|•||Home and Student 1PK – Licensed for home and student use on 1 Mac.|
|•||Home and Student Family Pack - Licensed for home and student use on 3 Macs per household.|
|•||Academic version – Licensed for qualified Academic use on 1 Mac.|
|•||Purchasing a card with a 27 digit PIN:|
|•||Home and Business 2 Pack – Licensed for 1 user for install on 2 Macs.|
If the number of activations for the product exceeds the number of activations (see table above) that the Microsoft Software License Terms allows, you must purchase additional copies of the product. To do this, visit the following Microsoft website:
See the Microsoft Software License Terms for information on how many times you can activate your product. Under the section for your version of product read the Installation and Use Rights. For example, if you have Office Home and Business 2011, see Section 2 and read 2. Installation and Use Rights. To view the terms, visit the following Microsoft websites: