Released to address issues that arise in products after Microsoft has already shipped software to customers, service packs typically includes bug fixes, technical modifications and feature additions. The Exchange 2000 Service Pack 3, however, will be released specifically to address issues the company discovered under its recent Trustworthy Computing initiative, said Jim Bernardo, product manager for the Microsoft's .Net Enterprise Server team.

As part of the Trustworthy Computing initiative, each division at Microsoft under went a code review, sweeping each piece of software in search of vulnerabilities. The code review is intended to make Microsoft's software more secure and reliable, and has become a top priority for the company by request of Bill Gates, the company's chairman and chief software architect.

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