This IDC Forecast Update revises the 2005-2009 forecast for Fibre Channel (FC) host bus adapters (HBAs). This document also discusses the major server, HBA pricing, and HBA product mix trends that drove adjustments to the previous forecast. For a full discussion of the forecast methodology and definition of terms, see the previously published Worldwide Fibre Channel Host Bus Adapter 2005?2009 Forecast and 2004 Vendor Shares (IDC #33347, May 2005).