We need to agree on how to refer to virtual folders. In the UI, I have 
seen them referred to as virtual folders, VFolders, vFolders. I 
think "virtual folder" is the best term. At least some users will be able 
to understand the functionality from that term, and it means people don’t 
have to understand a new word, vfolder. If there is agreement to 
use "virtual folder", the following changes need to be made:

1. Menu item: s/Create Virtual Folder From Message > VFolder on 
Subject/Create Virtual Folder From Message > Subject
2. Menu item: s/Create Virtual Folder From Message > VFolder on 
Sender/Create Virtual Folder From Message > Sender
3. Menu item: s/Create Virtual Folder From Message > VFolder on 
Recipients/Create Virtual Folder From Message > Recipients
4. Menu item: s/Create Virtual Folder From Message > VFolder on Mailing 
List/Create Virtual Folder From Message > Mailing List
5. Folder Pane: s/VFolders/Virtual Folders
6. New VFolder dialog - To open, choose Create Virtual Folder From Message 
> VFolder on Subject.
   s/New VFolder/New Virtual Folder
   s/vFolder Sources/Sources for Virtual Folder
7. Virtual Folder Editor dialog - To open, choose Tools > Virtual Folder 
Editor.
   s/vFolders/Virtual Folders

This bug blocks bug 246224.