: 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.
: Introduced PDF Reflow , allowing users to open PDF files directly in Word and edit them as if they were native documents. It also featured a "Read Mode" for a distraction-free viewing experience. Office 2013 64 Bits
Windows 7, Windows 8, Windows Server 2008 R2, or Windows Server 2012 : Many older third-party COM add-ins and macros
To run the 64-bit version effectively, your hardware must meet specific benchmarks: Requirement 1 GHz or faster x64-bit processor RAM 2 GB minimum (4 GB or higher recommended) Hard Disk 3.0 GB available space Operating System It also featured a "Read Mode" for a
The Definitive Guide to Office 2013 64-Bit: Performance, Compatibility, and Setup