C:Users<username>DocumentsOutlook Files
. If there is a .pst file here, you can try opening it in Outlook to retrieve a backup of your Sent Items. Please note that this is general advice only and the best course of action would be to get in touch with a local IT professional for help with this. To avoid this in the future, you can adjust the folder sync settings in your email software to sync the Sent Items to the server. We have some separate guides on how to do this.