An Outlook.com or Microsoft hosted mail storage quota can be anything from 2GB to 100GB. Here’s a full list of the mailbox limits, how to check your current usage and total allowed size.
We’re talking here about Microsoft mailbox hosting services including Outlook.com. NOT the various and confusing types of Outlook software.
Outlook.com free account 15GB
All free Outlook.com free accounts, including older Hotmail accounts, get a 15GB mailbox.
Outlook.com with Microsoft 365 – 50GB
If the @outlook.com address is linked to a Microsoft 365 Personal or Family plan you get 50GB of mailbox. That’s in addition to the 1 Terabyte of OneDrive space.
Microsoft 365 hosted mailbox – 50GB
Most Microsoft 365 hosted / Exchange Online mailboxes also have a 50GB quota.
That applies to:
- Microsoft 365 Business Basic
- Microsoft 365 Business Standard
- Office 365 Enterprise E1
Office 365 Enterprise – 100GB
The high-end Exchange Online / Microsoft hosted plans get 100GB per mailbox
- Office 365 Enterprise E3
- Office 365 Enterprise E5
Office 365 minimal plans – 2GB
Some low cost Enterprise plans with only access to web based apps, get a mere 2GB of mailbox storage.
- Office 365 Enterprise F3
- Exchange Online Kiosk
- Exchange Server 2013
Check your Outlook.com quota
Go to Settings | Storage to see the storage used and upper limit.
For paid or ‘Premium’ Outlook.com accounts (linked to Microsoft 365 Family/Personal) go to Settings | Premium | Features to see a 50GB quota.
Enterprise / Microsoft hosted mailboxes
Settings | General | Storage to check if you have 2GB, 50GB or 100GB.
Detailed Drill down
If you’d like more detail about what folders are taking up storage, use Outlook for Windows.
Right-click on the mailbox heading in the left Navigation Pane (i.e. showing the email address) choose Data File Properties | General | Folder Size … and finally the Server Data tab. You’ll have to wait while the server info is collated.
Unfortunately, the columns aren’t sortable (come on Microsoft, it’s 2021 for heavens sake!).
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Microsoft seems reluctant to disclose the Outlook.com storage limits. If you’re confused or wasted time trying to find the answer, you’re forgiven.
A Microsoft web page labelled Storage limits in Outlook.com does NOT clearly say what the storage limit is! Click on the heading “How to clean up your mailbox” and the vital information, promised in the heading, is revealed.
“Microsoft offers 15 GB of email storage space per free Outlook.com account. Microsoft 365 subscribers get 50 GB of space.”
Searching for terms like ‘Outlook.com free mailbox size’ shows a totally wrong answer!
100GB is the limit for high-end Microsoft 365 Enterprise plans only.
To be fair, that prominent wrong result is Google’s mistake not Microsoft’s. Bing gives more accurate results in this case.