Choosing Between 64-bit or 32-bit Versions of Office

Applies To:

Add-ins Compatibility: Add-ins or MDE files for a 32-bit version cannot run on a 64-bit version and vice versa.

Default Installation: 64-bit version is automatically installed unless the 32-bit version is explicitly selected.
Switching Versions: To switch versions (e.g., from 64-bit to 32-bit), uninstall the existing version first.
Installation Steps: Detailed steps are available under 'Install Office on a PC'.

Resource Availability: Greater processing power and memory (up to 18.4 million Petabytes).
Large Data Sets: Better for handling enterprise-scale Excel workbooks, large data sets, and extensive data connections.
Complex Media: Suited for large pictures, videos, and animations in PowerPoint.
Large Projects: Effective for handling files over 2 GB in Project.
In-house Solutions: Facilitates the development of 64-bit in-house Microsoft 365 solutions.
Large Number Data Type: Supports larger numbers effectively in Access.

System Limitations: Required for systems with:
- 64-bit Windows 10 with ARM-based processor
- 32-bit OS with x86 processor
- Less than 4 GB RAM
Software Compatibility: Best for systems using:
- 32-bit COM Add-ins without 64-bit alternatives
- 32-bit controls and VBA code using Declare statements
- 32-bit MAPI applications for Outlook
Legacy Support: Necessary for legacy Equation Editor, 32-bit OLE servers, or old embedded media in PowerPoint.

Installation guidance for both 32-bit and 64-bit versions is available in 'Install Microsoft 365 or 2016 on a PC'.

Troubleshooting: On issues like installation errors and lack of 64-bit alternatives.
Further Reading: Links to specifications, limits, and development guidelines for both versions.

Help and Feedback: Users can access online support, community forums, and provide feedback to Microsoft.

Choose the version based on your specific needs, system capabilities, and compatibility with existing software and add-ins.