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Any folder name prefixed by "$" or "( )" would not be visible to either a Notes client or an Internet client. These folders would be flagged as either a System or Hidden item. This feature is unsupported in 5.0.1a.

folder flag = 16 means folder is system
folder flag = 32 means folder is hidden
folder flag = 48 means folder is system and hidden.

The folder is NOT visible to the IMAP client if:

folder flag = 48 and not named "inbox" or "trash"
folder flag = 16
folder flag = 32