Outlook.com used on a desktop device will give the best experience for cleaning up your email. If you prefer to use a mobile device, Outlook.com accessed via a mobile browser offers a cleanup experience focused on helping you delete your largest emails. You can also use the Outlook app and filter your inbox or other folder by "has attachments" to see items that have the largest impact to your Microsoft storage.
What is the best way to manage storage in Outlook Mobile?
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