License & Subscription Issues

How to Use Microsoft 365 Subscriptions for Two Companies on One Computer

Chanuka Geekiyanage Oct 21, 2026 869 views

Question details

The user wants to use two separate Microsoft 365 work accounts from different companies on the same computer without installing multiple versions of Office.

How to Use Microsoft 365 Subscriptions for Two Companies on One Computer

Product: Microsoft 365
Device & OS: not provided
Scenario: Managing multiple business accounts and subscriptions for different organizations on a single computer.
Observed behavior: The user needs to seamlessly switch between Company A's Microsoft 365 Apps for business and Company B's Business Basic within the same Office desktop installation.

Before you start

Ensure you have the login credentials for both company accounts and verify that your primary Microsoft Office desktop applications are fully updated.

Solution 1Recommended

Add and Switch Between Multiple Microsoft 365 Accounts in Office

You only need one installation of the Office applications. You can add your second company's account directly within the Office apps to access its services.

Two separate Microsoft 365 work accounts can coexist perfectly on one computer. Because the desktop applications are already licensed and installed through your primary company, a Business Basic license for the second company is sufficient to access its respective files and cloud services.

Open an Office application

Launch any installed Microsoft Office desktop application, such as Word or Excel, that is already signed into your primary Company A account.

Navigate to the Account settings

Click on the "File" tab located in the top-left corner of the application window, and select "Account" (or "Office Account") from the left-hand navigation menu.

Add the second account

Under the "User Information" or "Connected Services" section, click on "Add Account" or "Add a service" > "Storage" > "OneDrive for Business" depending on your specific version.

Sign in with Company B credentials

Enter the email address and password for your second company's Business Basic account to link it to your existing Office installation.

Switch between accounts

To switch between the two companies, click on your profile picture or initials in the top-right corner of the application's title bar and select the desired account from the dropdown menu.

Add and Switch Between Multiple Microsoft 365 Accounts in Office

Licensing Requirement Met: Even though Business Basic does not include desktop app licenses, your Company A subscription covers the software activation. Adding Company B simply connects its cloud storage (OneDrive/SharePoint) to your local apps.

Free Microsoft Office alternative

Manage Multiple Work Profiles Seamlessly with WPS Office

If juggling multiple Microsoft 365 subscriptions and navigating account switching becomes cumbersome, consider trying WPS Office. It provides an intuitive, lightweight, and completely free productivity suite that integrates Word, Excel, and PowerPoint alternatives into a single window, making multi-organization file management effortless.

1. Download WPS Office: Visit the official WPS Office website and click the free download button for your operating system.
2. Install the application: Run the downloaded setup file and follow the on-screen prompts to complete the installation.
3. Start managing your files: Open WPS Office and utilize the unified workspace to seamlessly edit documents, spreadsheets, and presentations from different company folders in one place.

Fully compatible with Microsoft Excel, Word, and PowerPoint formats (.xlsx, .docx, .pptx).All-in-one tabbed workspace allows you to open and manage files from multiple companies simultaneously without switching accounts.Completely free to use with no complex enterprise licensing tiers or concurrent activation restrictions.Lightweight installation consumes minimal system resources while matching Microsoft Office's core capabilities.

microsoft office alternative - wps office

Frequently Asked Questions

Can I use Microsoft 365 Personal and a Business account on the same computer?

Yes. You can link both a personal Microsoft account and a work or school account to the same Microsoft Office desktop installation. Simply navigate to File > Account within any Office app to add your alternative account.

Will adding two company accounts merge my OneDrive files?

No. Each Microsoft 365 account maintains its own distinct and secure OneDrive for Business and SharePoint directories. They remain entirely isolated from one another, even when accessed through the same Office desktop installation.

Do I need to pay for desktop app licenses for both companies?

No, as long as one of your active accounts (e.g., Company A) has a subscription that covers desktop applications (like Microsoft 365 Apps for business or Business Standard), the local software is fully activated. Your second account only needs a Basic license to access its cloud services through those activated apps.

Login & Account Issues