How to Run Office 2010 and Microsoft 365 Together on Windows 10
Question details
The user needs to know if Microsoft Office 2010 and Microsoft 365 can be installed and used simultaneously on a Windows 10 computer, and how to resolve common version switching issues.
- Product
- Microsoft Office 2010, Microsoft 365
- Device & OS
- Windows 10
- Scenario
- Installing and using two different versions of Microsoft Office on the same computer for specific application needs.
- Observed behavior
- Coexistence is possible, but users frequently encounter "Office is configuring" dialogs when switching versions, along with default application and Outlook profile conflicts.
Ensure you have the installation media and product keys for Office 2010, and an active subscription for Microsoft 365. It is highly recommended to back up your Outlook data files, as running multiple versions of Outlook simultaneously is not supported and can corrupt profiles.
Install Multiple Office Versions in the Correct Order
To minimize registry conflicts and shared file issues, you must always install the older version of Office before the newer version.
Running two versions of Office on the same operating system is possible, but they must be deployed in a specific sequence. Shared components between the two versions are handled by the newer release, so installing out of order will break legacy compatibility.
Run the Office 2010 installer from your disc or download file and complete the setup process. Open an application like Word 2010 to ensure it activates and functions correctly.
Log into your Microsoft account on the web and download the Microsoft 365 installer. Run the setup to install the modern Office suite alongside the older version.
Since only one version can be the default handler for your documents, open the Windows Settings app, go to 'Apps' > 'Default apps', and select your preferred version for opening specific file types.
If file associations are still incorrect, open Control Panel > Programs and Features, select the Office version you want as default, click 'Change', and run a 'Quick Repair'.
Bypass the 'Office is Configuring' Message via Registry
When you open Word 2010 after using Word 365, Office attempts to re-register itself. You can disable this automatic configuration via the Registry Editor.
Avoid Version Conflicts with WPS Office
Running multiple versions of Microsoft Office often leads to frustrating registry errors, configuration loops, and file association conflicts. WPS Office is a free, lightweight alternative that handles legacy formats (like Office 2010's .doc/.xls) and modern Microsoft 365 formats (.docx/.xlsx) seamlessly in a single, unified application.
- 1. Download WPS Office: Visit the official WPS website and download the free installer for Windows.
- 2. Install the software: Run the setup file. WPS Office installs quickly without interfering with existing Office installations.
- 3. Open your documents safely: Drag and drop any legacy or modern Office file into WPS Office to view and edit it without triggering configuration pop-ups.
Frequently Asked Questions
Can I use both Outlook 2010 and Outlook 365 on the same Windows 10 computer?
No, Microsoft does not support running multiple versions of Outlook on the same machine. Doing so will inevitably corrupt your mail profiles and cause send/receive errors. It is strongly recommended to use only the Microsoft 365 version of Outlook.
Why do I see an 'Office is configuring' message when switching between Word versions?
This happens because each Office version checks the Windows registry to ensure it is the default program. When you switch, the application attempts to re-register its own specific keys. You can bypass this loop by adding a 'NoReReg' DWORD value in the Registry Editor.
How do I choose which Office version opens my files by default?
You can force your operating system to set a specific version as the default by running an Office Repair on your preferred version. Open Control Panel, navigate to Programs and Features, select the Office version you want to handle your files by default, click 'Change', and select 'Quick Repair'.
Is Office 2010 still supported for use on Windows 10?
Office 2010 has reached its end of support, meaning it no longer receives security updates, technical support, or bug fixes. While it can physically run on Windows 10 alongside Microsoft 365, using it poses security risks and compatibility limitations.
