Securing Exchange With ISA Server 2004
You might be thinking that running Exchange Server 2003 on the Internet itself is tempting, however you should be concerned with the security issues in doing so -- there are many attacks and automated scripts in the hands of hackers that pound on Exchange machines and attempt to compromise them. Outlook Web Access can be a useful option, however there are security issues with deploying this as well. And the fact remains that sometimes you absolutely need to provide full access for Microsoft Outlook clients, and the Web Access front-end just won't cut it.