In most cases, install the 32-bit version of Microsoft Office. We recommend the 32-bit version of Office, because it helps prevent compatibility issues with most other applications, especially third-party add-ins.
Office installs the 32-bit version automatically even if your computer is running 64-bit editions of Windows. You might want to install the 64-bit version of Office if you usually work with extra-large databases or worksheets or develop for the 64-bit platform.
If you already have a 64-bit version of Office installed on your computer running a 64-bit operating system, 64-bit version of Office is automatically installed.
What’s included in the 64-bit version of Office?
Most things included in the 32-bit version of Office are included in the 64-bit version of Office.
The following are some things not in the 64-bit version of Office.
ActiveX controls library, ComCtl This library contains ActiveX controls used to build solutions. It is most commonly used in Microsoft Access, Microsoft Excel, and Microsoft Word.
SharePoint List control The list view in SharePoint Technology isn’t available in 64-bit version of Office.
Compatibility with existing Office files and solutions
The 64-bit version of Microsoft Office isn’t compatible with any other 32-bit version of Office programs. So you must first uninstall all 32-bit versions of Office programs before you install the 64-bit version of Office. The Office disc includes both 32- and 64-bit versions. To install 64-bit Office, you must run Setup.exe from the x64 folder.
ActiveX controls library, ComCtl Any solutions using these controls don’t work. No good alternatives are available for some of these controls.
Third-party ActiveX controls and add-ins None of these work with the 64-bit version of Office.
Note: There is no 64-bit version of Visual Basic 6, so many of these objects need to be ported and rewritten.
Microsoft Visual Basic for Applications (VBA) VBA only contains the Declare statement work in the 64-bit version of Office if you update the code manually.
Compiled Access databases The .MDE and .ACCDE files, a common way for Access application developers to distribute solutions and protect their intellectually property, don’t work in the 64-bit version of Office. You must contact the application developer to recompile, retest, and redistribute the solution in the 64-bit version.
Operating systems required to run 64-bit version of Office
Your computer must be running at least 64-bit edition Windows 7, Windows Server 7, or Windows 8.
Install the 64-bit version of Office
Important: If you already have a 64-bit version of Office installed on your computer running a 64-bit operating system, running Setup from the root folder installs the 64-bit version of Office.
Any add-ins you want to run for Office must also be 64-bit editions.
If you ran Office Setup from the root folder, and you clicked Customize, click Close to exit Setup.
Click Yes to cancel Setup, and then click Close .
Go to the x64 folder on the Office disc, and double-click Setup.exe to run the 64-bit version of Setup.