Unitech PA950 - Manual (Page 169)

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Receiving entire messages consumes storage memory.
The size column in the message list displays the local size and server
size of a message. Even when a message has been downloaded fully,
these numbers may differ because the size of a message can vary
between the server and the device.
See Also: About Folders
Set up or change an account
Read and Respond to Messages
Download messages
Reply to or forward a message
Find a message
Receive attachments
Receive meeting requests
Download messages
The way you download copies of messages depends on how you are
receiving messages:
If you receive e-mail messages through ActiveSync, begin synchronization.
If you receive e-mail messages through a remote e-mail server, see
Download messages from the server.
See Also: About Synchronizing Inbox