Comment 9 for bug 85579

Additional information. When a user creates a Local folder with a comma in the
name, we create a duplicate folder with a randomly generated name after closing
and reopening app.

1. Launch mail
2. Create a new folder under Local Folders called: comma, this
3. Open the folder, you get the "unknown error 80520012", OK this error
4. Drag messge in that folder
5. Exit app
6. Launch mail again and view your Local Folder

Result: You will have a duplicate of comma, this . The dup folder has a
randome name something like this 8c798a9. It will have the message in it too.
Expected: If the comma was illegal, we shouldn't allow the name. If the comma
is legal, we shouldn't create a dup folder.

Note: If this folder was migrated from 4.7 it will substitue the comma for an
Underscore (example comma_this).

This confuses the user, and I have found dataloss when you delete the random
folder, it deleted the message in the original folder. If the user had done a
shift delete or deleted the trash the message is not retrievable.