You have the ability to share a file or folder with an external user.
But this is only available for your OneDrive folder and not the collaboration spaces or department drives.
The link that is sent to the external user will be good for 60 days.
1. Select what you want to share. Then click the share button.
2. Make sure to edit the permissions to allow Anyone with the link to use the link
3. Enter the email address of the person you wish to share the link with (if you sharing with a large number of people, scroll down for more information)
If you do not have the settings set properly you will be given an error.
4. If you are wanting to send to a large group of people choose Copy Link
Make sure to have the settings set properly and copy the link into an email message.