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How to Convert Office LTSC 2021 from 64-Bit to 32-Bit
Question details
The user needs to change their Microsoft Office LTSC 2021 installation from the 64-bit architecture to the 32-bit architecture.
- Product
- Microsoft Office LTSC 2021
- Device & OS
- not provided
- Scenario
- Switching system architecture versions for compatibility with specific legacy add-ins or applications.
- Observed behavior
- Direct conversion is impossible; the existing 64-bit version must be completely removed before the 32-bit edition can be installed.
Before making changes, verify whether your organization manages your Office deployment. If it does, you must contact your IT administrator rather than attempting a manual reinstallation.
Uninstall and Redeploy using the Office Deployment Tool
Since direct conversion is not supported, you must completely uninstall the 64-bit version and then reinstall the 32-bit version using the Office Deployment Tool (ODT).
Microsoft does not offer a one-click transition between architecture versions. The 64-bit applications must be entirely removed to prevent conflicts before the 32-bit versions are deployed.
Open the Control Panel, navigate to Programs and Features, select your Microsoft Office LTSC 2021 installation, and click Uninstall. Follow the prompts to remove the software completely.
Navigate to the official Microsoft Download Center, download the latest version of the Office Deployment Tool, and extract its contents to a local folder on your computer.
Open your deployment XML configuration file in a text editor (like Notepad). Locate the Add element and change the architecture attribute by typing OfficeClientEdition="32".
Open Command Prompt as an administrator, navigate to the folder where you extracted the ODT, and run the command 'setup.exe /configure configuration.xml' to initiate the 32-bit installation.
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Frequently Asked Questions
Why might I need the 32-bit version of Office instead of the 64-bit version?
The 32-bit version is often required for compatibility with older COM add-ins, legacy database systems (like 32-bit Access databases), or 32-bit hardware controls that do not have updated 64-bit alternatives.
Will I lose my documents if I uninstall the 64-bit version of Office?
No, uninstalling the Office application only removes the software itself. Your Word documents, Excel spreadsheets, and other personal files will remain safely stored on your local drive.
Can I install both the 32-bit and 64-bit versions of Office on the same computer?
No, Microsoft does not support installing both 32-bit and 64-bit versions of Office, Visio, or Project simultaneously. You must commit to a single architecture for all Office products on a given machine.
