IIS 6.0, included with Windows Server 2003, does have a POP (Post Office Protocol) server that is capable of storing messages for mail clients, and would suit your needs perfectly. If you don't want to upgrade to Windows Server 2003 (or Microsoft Small Business Server 2003—even better), you will need to install mail server software. Microsoft Exchange Server (included with Small Business Server 2003) is one such mail server:
Exchange isn't cheap, but it's full-featured, and you can probably get an academic discount from Microsoft.
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