edition is the most comprehensive tier, designed for volume licensing in corporate environments. Microsoft Learn Key Applications

If you have a (e.g., from a retail copy or volume license), the 64-bit version requires:

: This was the first Office release to offer a native 64-bit version, which allowed for better RAM efficiency when working with massive data sets.

Microsoft Office 2010 Pro Plus X64 -pre-activated- Link Guide

edition is the most comprehensive tier, designed for volume licensing in corporate environments. Microsoft Learn Key Applications

If you have a (e.g., from a retail copy or volume license), the 64-bit version requires:

: This was the first Office release to offer a native 64-bit version, which allowed for better RAM efficiency when working with massive data sets.