This IDC update provides the worldwide market and vendor share results for PC processor vendors in these segments for the third calendar quarter of 2008:

• Worldwide overall PC microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide overall PC microprocessor revenue share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide desktop PC microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide mobile PC microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide PC server microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide PC microprocessor overall average selling prices and unit shipments for 3Q06–3Q08

The accompanying Excel spreadsheet data file includes the results of IDC's quarterly PC microprocessor studies from 1Q05 to 3Q08 in a pivot table format. The pivot table's data list, study definitions, and research methodology are also included.

Drafts of this IDC update and data file were sent via email to clients of IDC's Semiconductors: Personal Computing research program on October 24, 2008.