How to check Outlook mailbox storage usage

Do you know how much storage you have left in Outlook? Here' show to find out.

Outlook web storage usage
Outlook web storage usage

Although is free to use, it doesn’t come with infinite storage. The free tier only offers 15GB of space, which, even though it should be enough for most home users, depending on how you use the service, the day may come when the space will run out, even more now that Microsoft plans to change what files count toward the quota in early 2023.

If you want to stay informed on the space usage in your account, the Outlook settings include a page that shows how much storage you are using and options to free up space.

This guide will teach you the steps to check the storage usage of your mailbox account on Windows 11, 10, macOS, or Linux.

Check Outook mailbox size limit online

To determine the storage usage of your Outlook mailbox, use these steps:

  1. Open

  2. Sign in with your credentials (as needed).

  3. Click the Settings (gear) button on the top-right corner.

  4. Select the “View all Outlook settings” option at the bottom.

    Outlook web settings

  5. Click on General.

  6. Click on Storage.

  7. Confirm the storage usage for your inbox, sent, and deleted items in

    Outlook storage usage

  8. (Optional) Use the Empty option to free up space by removing deleted, sent, archive, and inbox items.

Once you complete the steps, the settings page will display the storage usage and how much space you have left in your account.

If you’re running low on space, Microsoft offers an additional 50GB when you sign up for a Microsoft 365 subscription.

About the author

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 14 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and Email him at [email protected].