In addition to files from your computer and OneDrive, Outlook.com lets you attach files from third-party storage accounts like Box or Dropbox to your messages. To attach files from a third-party storage account, you'll need to connect it to your Outlook.com account.
Connect a storage account
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Select Settings
> View all Outlook settings. -
In Settings, select Mail > Attachments.
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Under Storage accounts, select the storage account you want to connect.
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Provide a username and password for the storage account.
Remove a storage account
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Select Settings
> View all Outlook settings. -
In Settings, select Mail > Attachments.
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Under Storage accounts, select Remove below the account you want to remove.
