Email: Sending Large Files

Office 365 limits the size of each email to 100 MB.  If sending messages through Outlook for the web (OWA), each individual attachment has a 25 MB maximum.  If you need to send files larger than these limits, follow the instructions below to deliver the file through the WUSTL Box system:

  1. Login to WUSTL Box using your WUSTL Key at
  2. Drag-and-drop the file onto your WUSTL Box file view area and wait for the file to finish uploading
  3. Next to the uploaded file, select “Share”
  4. On the sharing window:
    • Turn on “Enable shared link” by selecting the toggle button
    • Under the “Access” drop-down, select “People in your company”
  5. Copy the generated Link, and then click the “Close” button
  6. Send the link via email to your intended recipient(s)

Back to Email & Calendars page.