Microsoft has just published Exchange Server 2003 update rollup for Process Flow Documentation. This update rollup contains hotfixes that apply to Microsoft Exchange Server 2003 Process Flow Documentation (PFD) and released after Service Pack 2 (SP2).
Process Flow Documentation (PFD) provides support personnel with a detailed and technically accurate view of how given processes within a product are supposed to work. This view is designed to complement daily troubleshooting and to enable support personnel to isolate problems more efficiently.
Knowledge Base article: Exchange Server 2003 update rollup for Process Flow Documentation