Office 2013 64: Bits

: Many older third-party COM add-ins and macros are designed for 32-bit Office. These will not work on the 64-bit version unless they have been explicitly updated by the developer.

The 64-bit version of Office 2013 includes several features that take advantage of the increased memory and processing power of 64-bit operating systems, including: Office 2013 64 Bits

If you want to learn more about Office 2013 64 bits, here are a few additional resources: : Many older third-party COM add-ins and macros