When the .pickfolder method of a namespace object is used to select a folder,
is there a way to determine the mailbox or store in which the folder exists?
For example, if the user has access to multiple mailboxes and selects
'Inbox', I would like to be able to determine whose Inbox was actually
selected.

I'm thinking that the .parent property of the folder won't be an option
since the user could select a subfolder.