Dear Dave Nordbrock
Welcome to Microsoft Community.
We understand that your Miscellaneous folder is missing and you need to restore it.
Can you tell us what mailbox's Miscellaneous folder has disappeared?
What version of Outlook do you have?
What version of Outlook do I have? - Microsoft Support
If you have a Microsoft mailbox, we recommend that you check your mailbox by going directly to outlook.live.com.
Check if your web version has this miscellaneous folder.
If not it is recommended that you check your Deleted or Recoverable folders for this folder.
If neither, it means this folder is no longer in your server.
I hope the above information is helpful to you.
Looking forward to your reply.
Best Regards,
Peter.Y-MSFT | Microsoft Community Support Specialist