Accidents happen. When that sudden realization hits days later that you need an email message that’s long gone, the Recover Deleted Items command might save your day. You can recover some deleted items, like messages, appointments, contacts, tasks, and notes, even after the Deleted Items folder is emptied or you’ve “hard deleted” an item by pressing Shift+Delete.
While in OWA:
Click Folder > Recover Deleted Items.
Click the message you want to recover, and then click Recover Selected Items .
TIP To select multiple items, press Ctrl as you click each item, and then click Recover Selected Items .
Recovered items are restored to the folder you’re working in.
NOTE Deleted items are kept for 14 days.