Collaborating with colleagues on a report or project? Don't send copies. Send a link instead.
The trick is to upload files to OneDrive and then send everyone a link to the files. Your recipients can collaborate on the same file at the same time, and you don't have to scour your inbox for multiple copies.
SelectAttach File>Browse web locations >OneDrive. You can tell you're sending a link to a OneDrive file because the attachment icon will have a cloud on it.