Sometimes you need to know which platform or version of Microsoft Office you are using:
In Office 2013
1.Open an Office 2013 program.
2.Click File > Account.
3.Under Office Updates, you can see the version, but to see both the version and platform, click About program name (like About Word).
Microsoft Word 2013 (15.0.0000.0000) MSO (15.0.0000.0000) 32-bit
In Office 2010
1.Open an Office 2010 program.
2.Click File > Help.
3.Under About Microsoft program, (like About Microsoft Word) the version is listed with the platform, similar to this:
Version: 14.0.0000.0000 (32-bit)
32-bit (x86) and 64-bit (x64) refers to a computer's processor and the set of instructions that can be executed by the processor. This is a shorthand way to refer to the computer's components, also known as the 'platform' or 'architecture,' that directly affects the computer's memory processing capability.
x64 (64-bit) processors have been used in workstations and servers since the early 1990s. In 2003, they began being used in personal computers.