New
#11
WLM stores messages related to a specific POP3 account under the account. However when it comes to newsgroups or IMAP email accounts, where messages are typically left on the server, there are no folders for storing WLM local objects under the account. That's because the account is reserved for displaying what is on the server. So WLM puts local drafts, sent items, and deleted items related to all of those account types under storage folders. This includes imported files since it's not evident under which pop3 account imported objects belong.
You can't delete the 3 built-in folders under "Storage"; you can delete anything else you added. The storage area may come in handy for saving items from one of the accounts before deleting the account; otherwise when you delete the account all the saved messsages under it will be deleted with it. Also, your friend may want to try imap or newsgroups someday and they won't work right without the storage area.