|The offline mode allows you, to work on your existing emails without having internet access.|
It means, you can read, write and reply to emails, even without internet access and outlook and outlook express do not try to connect to the internet in offline mode.
Next time, you're connected to the internet and you run outlook in online mode, all emails you wrote in offline mode, all replies and so on, will be send out to it's destination.
Hope that makes things clear.
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