Storage space for your Outlook.com email is ever-growing, but If the amount of email in your inbox and folders grows too fast, it may bump up against the account's quota, and you might not be able to send or receive any messages. People who send you email will get an error message that your inbox is full. Here's how to make a little room until your storage space is increased.
Empty your junk folder. Right click Junk, and then click Empty folder.
Sweep unwanted email from your inbox or archive folders.
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Save space-hungry photos and docs in OneDrive, not email.
In whichever folder you archive mail, sort the message list by clicking Arrange by, and then clicking Size.
If the message list sorts with the smallest messages on top, click Arrange by > Size again to put the largest messages on top.
Click the first email with attachments you want to back up to OneDrive, then click Download all as zip. - or - If there's only one attachment, click Download.
When a pop-up appears at the bottom of your screen, click the arrow next to Save, and then click Save as.
Click OneDrive, navigate to the folder you want to store the attachments in, and then click Save.
Go to your OneDrive and make sure the attachments were saved. If so, delete the email.
Repeat steps 2-6 as desired.
For more help with sending, receiving, and reading email, contact customer support.
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