Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi, if you removed only the attachment but still have the email, the quickest option is to ask the sender to resend it. Also check Downloads or OneDrive for a copy you previously saved.
If you deleted the whole email, open Deleted Items >> right-click the email >> Move >> Inbox. If it’s missing, select Deleted Items >> Home >> Recover Deleted Items From Server, if available >> select the email >> Restore Selected Items >> OK.