If you've installed the versions of Exchange 2000 or Exchange 2003 that ship with Small Business Server (SMS) 2000 or SMS 2003, respectively, then you have access to a "POP3 Connector" that will allow you to download mail automatically from your ISP account.
If, however, you're planning on using the non-SBS versions of Exchange 2000 or Exchange 2003, then you'll either need to find a third party POP3 Connector or work with your ISP to implement a workaround using TRN or ETRN. If the former approach interests you, fire up your favorite Internet browser and search for "POP3 CONNECTOR" MICROSOFT EXCHANGE or similar and review the different options returned by your query. If you'd like to try the latter approach, then you'll need to contact your ISP to see if they would support queueing your mail until your server connects and issues a TRN or ETRN command. If the ISPs server supports either of these verbs, then mail will automatically be dequeued and delivered to your Exchange server on whatever schedule you have defined.
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