Office 2013 64-bit is not for everyone. It’s for the analyst with the 4GB pivot cache. It’s for the Access developer supporting a warehouse inventory system. It’s for the Windows 7 holdout who needs a modern-ish Office without the subscription tax.

: You cannot have both 32-bit and 64-bit versions of Office installed on the same computer. If you wish to switch, you must fully uninstall the existing version first. System Requirements & Installation