Uninstall & Reinstall Issues

How to Switch Microsoft Office from 32-Bit to 64-Bit Without Losing Settings

Maira Mehtab Sep 20, 2026 869 views

Question details

The user needs to upgrade their Microsoft Office installation from the 32-bit version to the 64-bit version on a Windows 10 Pro system without losing their existing application and Outlook settings.

Product: Microsoft Office
Device & OS: Windows 10 Pro
Scenario: Switching Microsoft Office architecture (32-bit to 64-bit) on a compatible 64-bit operating system while preserving existing profiles.
Observed behavior: The system is currently running 32-bit Microsoft Office. The goal is to uninstall it and cleanly install the 64-bit version while retaining all prior configurations and Outlook profiles.

Before you start

Verify that your Windows 10 installation is a 64-bit operating system by checking Settings > System > About. A 64-bit version of Office cannot be installed on a 32-bit operating system.

Solution 1Recommended

Back Up Registry Settings and Reinstall Office

Safely preserve your Microsoft Office and Outlook settings by backing up the relevant registry keys before performing the uninstallation.

Office settings are primarily stored within the Windows Registry. Exporting these settings ensures you can restore your customized environment and Outlook profiles after installing the new 64-bit version.

Open Registry Editor

Press the Windows key + R, type 'regedit' in the Run dialog box, and press Enter to launch the Registry Editor.

Locate Office Settings

In the left pane, navigate to the following path: HKEY_CURRENT_USER\Software\Microsoft\Office. This folder contains your current user configurations for all Office apps.

Export the Registry Key

Right-click on the 'Office' folder, select 'Export', choose a secure location (like your Desktop) to save the .reg file, and name it 'OfficeSettingsBackup'.

Uninstall 32-bit Office

Go to Windows Settings > Apps > Apps & features, locate your Microsoft Office installation in the list, and select 'Uninstall' to completely remove the 32-bit version.

Install 64-bit Office

Log into your Microsoft account online, download the 64-bit offline installer (or select the 64-bit version from the advanced installation options), and complete the setup process.

Settings Restoration: In most cases, the new installation will automatically detect your existing settings. If not, you can double-click your 'OfficeSettingsBackup.reg' file to merge the settings back into the registry.

Solution 2

Verify Add-in Compatibility Before Switching

Review your current add-ins and third-party software to ensure they are fully compatible with 64-bit Office architecture.

Free Microsoft Office alternative

Try WPS Office: A Lightweight, Fully Compatible Alternative

If you are dealing with complex installation issues, registry backups, or compatibility problems while switching Office versions, consider switching to WPS Office. It provides a lightweight, unified office suite that installs quickly on 64-bit systems without the heavy configuration hassle.

1. Download the Installer: Visit the official WPS website and click the free download button to get the latest version.
2. Install the Suite: Run the setup file. The installation is unified and automatically optimizes for your Windows environment.
3. Open Existing Documents: Once installed, you can double-click any of your existing Word, Excel, or PowerPoint files to continue working seamlessly.

Fully compatible with Microsoft Office formats including .docx, .xlsx, and .pptx.Unified, lightweight installer that runs efficiently on Windows 10 without architecture conflicts.Familiar interface allowing for a seamless migration with zero learning curve.Free to download and use with built-in PDF tools and cloud support.

Frequently Asked Questions

Do I have to pay again to switch from 32-bit to 64-bit Office?

No. If you have an active Microsoft 365 subscription or a valid Office product key, switching between the 32-bit and 64-bit versions is entirely free. You just need to download the appropriate installer from your Microsoft account dashboard.

Will I lose my Outlook emails if I uninstall the 32-bit version?

Generally, no. Your Outlook data files (.pst or .ost) are stored in your user profile (such as the Documents or AppData folders) and are not deleted when you uninstall the Office programs. Once you install the 64-bit version, it usually reconnects to these files automatically.

How do I know if my computer supports 64-bit Office?

You must have a 64-bit version of Windows. To check this on Windows 10, go to Settings > System > About and look at the 'System type' under Device specifications. If it reads '64-bit operating system', your computer supports 64-bit Office.

Can I install both 32-bit and 64-bit versions of Office on the same computer?

No, Microsoft does not allow both 32-bit and 64-bit versions of Office products to be installed on the same computer simultaneously. You must completely uninstall the 32-bit version before installing the 64-bit version.

Installation & Activation