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What version of Office am I using?
32-bit or 64-bit?

The bit version only applies to Office 2010 and above (365, 2013 and 2016). If you have Office 2007 or earlier, it only comes in 32-Bit so any add-in (plugin) you install need to be the 32-bit version.
What version of Office do I have?
If you see this user interface after you open an Office application
 You have this version
Microsoft Office 2003 You have Microsoft Office 2003.

Choose Help > About. From here, you can see the specific version installed. Office 2003 only comes in 32-Bit.


Microsoft Office 2007

You have Microsoft Office 2007.

Choose  Microsoft Office Button Click the Microsoft Office Button > Help. From here, you can see the specific version installed. Office 2007 only comes in 32-Bit.




Microsoft Office 2010 You have Microsoft Office 2010.

Choose File > Help. From here, you can see the specific version installed and also the bit version (32 or 64).


Microsoft Office 365/2013/2016 You either have Microsoft Office 365, 2013, or 2016.

Choose File > Office Account. From here, you can see the specific version installed and also the bit version (32 or 64). Click About Outlook.


 
Microsoft Office 2010

 

Microsoft Office 2010 - 64 bit



 
Microsoft Office 365/2013/2016

 

Microsoft Office 365/2013/2016 - 64 bit