(Answer) (Category) MSO Technologies FAQ : (Category) Using MSO resources : (Category) Network help : (Category) Horde: web accessible email, contacts, calendar... :
I can't make subfolders of folders to organize my email.
Making subfolders is possible, it just requires some planning.

If you were to create a folder called 

 MyEmail
This translates to an IMAP file. Hence no subfolders can be created inside of "MyEmail".

If you created 

 MyFolder/MyWorkEmail
Then 
 MyFolder/MyPersonalEmail
This would create a directory of "MyFolder" and two IMAP files "MyWorkEmail" and "MyPersonalEmail". "MyWorkEmail" and "MyPersonalEmail" would store email, "MyFolder" would not, since it is a directory and not an IMAP file.

If you then wanted 

 MyFolder/MyWorkEmail/Clients
This would require rebuilding the folder structure, since an IMAP file cannot be converted to a directory and it cannot hold another file.
"MyWorkEmail" would have to change to a directory, making it unable to hold any email itself, though a subfolder next to it could be created, i.e. "MyWorkEmailFolder".

Example: creating the following folders 

 MyFolder/MyWorkEmail/Clients
 MyFolder/MyWorkEmail/Proposals
 MyFolder/MyPersonalEmail/Family
 MyFolder/MyPersonalEmail/Enemies
 MyFolder/Strangers

Would result in the following email folders: 

 Clients, Proposals, Family, Enemies, and Strangers.

The following subfolders/directories: 

 MyFolder, MyWorkEmail and MyPersonalEmail
are incapable of holding email, only folders and other subfolders.
address-suppressed, address-suppressed
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