Outlook.com Email Attachment Size Limit

Can't send Outlook.com emails? You might be exceeding these limits

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Like all email providers, Outlook.com puts a limit on a number of email-related things. There's a per-email file attachment size limit, per-day sent email limit and per-message recipient limit.

However, these Outlook.com email limits are not too unreasonable. In fact, they're much larger than you might assume.

Outlook.com Email Limits

The size limit when sending emails with Outlook.com is calculated not only by the size of the file attachments but also the size of the message, like the body text and any other content.

The total size limit when sending email from Outlook.com is about 10 GB. That means you can send up to 200 attachments per email, with each being 50 MB a piece.

In addition to the message size, Outlook.com limits the number of emails you can send per day (300) and the number of recipients per message (100).

How to Send Bigger Files Over Email

Screenshots showing how to upload large files to Outlook.com, including numbered steps.
Screenshots, Outlook.com.

When sending large files and photos with Outlook.com if they exceed the available size limit, you'll be prompted to first upload the files to OneDrive. Not only does this make it easier for Outlook to send the file, but it also ensures the recipient is not restricted by their email service's size limits. This takes the burden off of not only your own account but also theirs if their provider doesn't accept really large files (many don't).

Another option when sending large files is to first upload them to a cloud storage service like Box, Dropbox, Google Drive, or OneDrive. Then, when it's time to attach the files to the email, just choose Cloud locations instead of Computer to send files that are already uploaded online.

If you want to send something even bigger, you can try emailing the files in smaller chunks, making a compressed ZIP file of the attachments, storing the files online and sharing download links to them, or employing another file sending service.