I figured it out and thought I'd post the solution in hopes that it will help
someone else. In my deleted items folder there were only mail items. No
amount of resorting or grouping would pop up task or calendar items that were
deleted. There was no plus sign to show other folders. I used the "Go" menu
between "view" and "tools". Select "folder" (the shortcut is Ctrl+Y) and
that brings up the folder tree. From there you can access the deleted item.
Once it's open you can right click and choose "move to" and put the file back
in it's rightful place. So happy to have my file back!!