Volume editions of Microsoft Office 2010 client products require activation than single license Office 2010 where you need to simply enter product key and activate. Microsoft Office 2010 KMS Host License Pack was developed to be a local volume activation method. To activate your Office 2010 client installations with KMS, you will need to set up a KMS host.
An Office 2010 KMS host is required if you want to use KMS activation for your volume editions of Office 2010. When Office 2010 volume edition client products are installed, they will automatically search for a KMS host on your organization’s DNS server for activation.
All volume editions of Office 2010 client products are pre-installed with a KMS client key, so you will not need to install a product key.