HTC P3400, User Manual, Page: 122 / 211

Exchanging Messages and Using Outlook 121
The folders you create and the messages you move will then be mirrored
on the e-mail server. For example, if you move two messages from the
Inbox folder to a folder named Family, and you have designated Family for
synchronization, the server creates a copy of the Family folder and copies
the messages to that folder. You can then read the messages while you are
away from your PC.
If you use a text message account, messages are stored in the Inbox folder.
If you use a POP3 account 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 e-mail server. The next time you connect, the e-mail server
will detect that the messages are missing from the Inbox folder on the
device and will delete them from the e-mail server. This prevents 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.
If you use an IMAP4 account, the folders you create and the e-mail
messages you move are mirrored on the e-mail server. Therefore, messages
are available to you anytime you connect to your e-mail server, whether it
is from your device or PC. This synchronization of folders occurs whenever
you connect to your e-mail server, create new folders, or rename/delete
folders when connected. You can also set different download options for
each folder.