The following computer systems can only install 32-bit Microsoft 365. For more information, see Using the Large Number data type. 64-bit VBA provides the LongLong data type which fully supports large numbers. You’re working with the Large Number data type in Access, and while this data type is supported by 32-bit Access, you may see unexpected results when executing code or expressions that use native 32-bit VBA libraries.

In-house Microsoft 365 solution developers should have access to the 64-bit Office 2016 for testing and updating these solutions. Using the 64-bit version of Microsoft 365 lets you deliver a 64-bit version of those solutions as well as a 32-bit version. You’re developing in-house Microsoft 365 solutions like add-ins or document-level customization. You’re working with files over 2 GB in Project, especially if the project has many sub-projects.

The 64-bit version of Microsoft 365 may be better suited to handle these complex slide decks. You’re working with extremely large pictures, videos, or animations in PowerPoint. With 32-bit apps, you might get as little as 2 GB of virtual address space which in many cases isn't enough and can cause the app to stop responding or crash. With 64-bit apps, you have up to 128 TB of virtual address space which the app and any add-ins running the same process can share. While 32-bit applications can work with add-ins, they can use up a system's available virtual address space. You're using add-ins with Outlook, Excel, or other Office apps. See Excel specifications and limits, Data Model specification and limits, and Memory usage in the 32-bit edition of Excel. The 64-bit version of Microsoft 365 may perform better in these cases. You’re working with large data sets, like enterprise-scale Excel workbooks with complex calculations, many pivot tables, data connections to external databases, Power Pivot, 3D Map, Power View, or Get & Transform. Therefore, if your scenarios include large files and/or working with large data sets and your computer is running 64-bit version of Windows, 64-bit is the right choice when: Also, 64-bit applications can access more memory than 32-bit applications (up to 18.4 million Petabytes). Reasons to choose the 64-bit versionĬomputers running 64-bit versions of Windows generally have more resources such as processing power and memory, than their 32-bit predecessors. If you're still not sure which version, 32-bit or 64-bit is a better choice for you, see the section below. See “Office (64-bit or 32-bit) couldn’t be installed” error. The same is true if you installed the 32-bit version, but want to install the 64-bit version. Important: If you install the 64-bit version, but want the 32-bit version instead, you must first uninstall the 64-bit version before installing the 32-bit version.

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