License & Subscription Issues

How to Increase Microsoft 365 Mailbox Storage & Send Teams Invites

Nimra Malik Sep 25, 2026 869 views

Question details

The user needs to know how to expand their Microsoft 365 mailbox storage capacity and how to send Microsoft Teams meeting invitations to remote participants.

Product: Microsoft 365, Outlook, Microsoft Teams
Device & OS: not provided
Scenario: The user is reaching their email storage limit and needs to upgrade capacity, while also needing to schedule online meetings via Microsoft Teams or Outlook.
Observed behavior: To successfully upgrade the Microsoft 365 subscription plan for more email storage and securely schedule an online meeting invitation.

Before you start

Ensure you have administrator access to the Microsoft 365 admin center, as standard users cannot modify subscription plans or mailbox limits. Additionally, make sure the Microsoft Teams application is installed and linked to your active Outlook account before attempting to send meeting invites.

Solution 1Recommended

Upgrade Your Subscription to Increase Mailbox Storage

Mailbox limits are tied to your specific Microsoft 365 plan. An administrator must upgrade the subscription to a higher tier to grant users more storage space.

Microsoft 365 restricts mailbox sizes based on the license assigned to the user. For example, Business Basic plans typically offer 50 GB, while Enterprise plans offer up to 100 GB. The only way to permanently increase the primary mailbox storage is to change the license.

Access the Admin Center

Navigate to Billing

On the left-hand menu, click on 'Billing' and then select 'Your products' to view your current active subscriptions.

Select and Upgrade Plan

Select the subscription you want to upgrade, click on 'Upgrade', and choose a plan that offers a larger mailbox capacity (e.g., upgrading from Business Standard to Enterprise E3).

Confirm and Assign

Complete the checkout process. Once the new licenses are active, assign them to the respective users in the 'Users' > 'Active users' section.

Upgrade Your Subscription to Increase Mailbox Storage

Alternative Archiving: If you cannot upgrade your plan immediately, consider enabling 'Exchange Online Archiving' to move older emails into an archive mailbox, freeing up space in the primary mailbox.

Solution 2

Send a Teams Meeting Invitation via Outlook or Teams App

You can quickly schedule and send meeting invitations directly from either the Microsoft Teams application or your Outlook calendar.

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Frequently Asked Questions

What is the default mailbox storage size for Microsoft 365?

The default size depends on your plan. Microsoft 365 Business Basic, Standard, and Premium plans generally include 50 GB of storage per user, while Office 365 E3 and E5 Enterprise plans include 100 GB.

Can I increase mailbox storage without upgrading my entire subscription?

You cannot increase the base limit of the primary mailbox without upgrading the license tier. However, administrators can enable 'Auto-expanding archiving' for users with an Exchange Online Plan 2 license, providing up to 1.5 TB of archive storage.

Why is the 'New Teams Meeting' button missing in my Outlook?

This typically occurs if the Teams Meeting Add-in is disabled. You can re-enable it in Outlook by navigating to File > Options > Add-ins. At the bottom, select 'COM Add-ins', click 'Go', check the box for 'Microsoft Teams Meeting Add-in for Microsoft Office', and click OK.

Login & Account Issues