Consider accessing your e-mail with POP3. Suppose you have configured your mail client to operate in the 'download-and-delete' mode. When the client (C) fetches all emails from the server (S), the sequence of messages exchanged starts as follows. C: list S: 1 498 S: 2 912 S: C: retr 1 S: blah blah ... blah S: ? How many messages does the server store for the client? It cannot be known 912 1 498 None of the mentioned

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