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License & Subscription Issues

How to Upgrade Selected Users from Microsoft 365 Plan 1 to Plan 2

Jason MillerJason Miller Oct 20, 2026 870 views

Question details

The user needs to increase the mailbox capacity for a specific subset of employees by upgrading their Microsoft 365 licenses from Plan 1 (50 GB limit) to Plan 2 (100 GB limit) without affecting the rest of the organization.

How to Upgrade Selected Users from Microsoft 365 Plan 1 to Plan 2
Product
Microsoft 365
Device & OS
not provided
Scenario
An administrator wants to allocate an upgraded enterprise license to only five specific users out of a 100-user organization to increase their mailbox storage.
Observed behavior
The user is seeking the correct procedure to purchase and assign the Plan 2 licenses to only the targeted individuals while effectively replacing their previous Plan 1 licenses.
Before you start

Ensure you have global admin or billing admin privileges in the Microsoft 365 admin center before attempting to purchase or modify user licenses.

Solution 1

Upgrade a Single Selected User to Plan 2

Purchase a Plan 2 license and assign it individually to a specific user's account.

1
Purchase a Plan 2 License

Log in to the Microsoft 365 admin center. Navigate to Billing, click on Purchase services, and purchase the required number of Plan 2 licenses.

2
Locate the Active User

Go to the Users menu and select Active users. Find and click on the specific user account you wish to upgrade.

3
Assign the New License

Open the 'Licenses and apps' tab in the user's details pane. Select the newly purchased Plan 2 license and uncheck the Plan 1 license, then save your changes.

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Frequently Asked Questions

What is the mailbox capacity difference between Microsoft 365 Plan 1 and Plan 2?

Generally, an Exchange Online Plan 1 license provides a 50 GB mailbox capacity per user, whereas a Plan 2 license doubles that capacity, providing a 100 GB mailbox. Note that exact limits may vary subject to specific subscription and service terms.

Will users lose emails during the upgrade from Plan 1 to Plan 2?

No, upgrading a license by replacing the existing assignment in the Microsoft 365 admin center is completely seamless. It simply expands the storage capacity and feature set; all user data, emails, and settings remain perfectly intact.

Why can't I find the Exchange Plan 2 option in the admin center?

Ensure you are navigating correctly to 'Billing > Purchase services'. If the Plan 2 option is still not visible, it might be due to restrictions based on your current base subscription tier or regional availability. In such cases, contacting Microsoft billing support is recommended.