Microsoft recommends 32-bit Office for most users
As more and more personal computers run 64-bit versions of Windows, it’s tempting to deploy the 64-bit version of Office 2013 to match. One benefit is that 64-bit Office allows users to work with larger sets of Excel and Project data. But, there are compatibility drawbacks for those users because Office add-ins and solutions might not work. That’s why 32-bit Office 2013 is recommended for most users.