Audiovox PPC6600 - Manual (Page 124)

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Section 9: Exploring Messaging
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If you use POP3 and you move e-mail messages to a folder
you created, the link is broken between the messages on
the device and their copies on the mail server. The next
time you connect, the mail server will see that the
messages are missing from the device Inbox and delete
them from the server. This prevents you from having
duplicate copies of a message, but it also means that you
will no longer have access to messages that you move to
folders created from anywhere except the device.
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If you use IMAP4, the folders you created and the e-mail
messages you moved are mirrored on the server.
Therefore, messages are available to you anytime you
connect to your mail server, whether it is from your
device or PC. This synchronization of folders occurs
whenever you connect to your mail server; create new
folders, or rename/delete folders when connected.