I believe the OP wants to know if one can set up an email client, such as Outlook, Outlook Express, Mozilla Thunderbird, etc. for his Blackerry email address, as opposed to logging in via the web client.
The steps offered in the previous post regarding Outlook merely demonstrate another method of opening a browser to access the Blackerry Web Client, which is what the OP doesn't want to do.
I believe this question was posted some time ago, and the consensus was that the ability to access your Blackberry email via a POP or IMAP client was not possible. Hopefully it will be offered in the future, as many of us would value such a utility.