This IDC update provides the worldwide market and vendor share results for PC processor vendors in these segments for the third calendar quarter of 2009:

• Worldwide overall PC microprocessor unit share by vendor, 3Q09 with 2Q09 and 3Q08 comparison
• Worldwide overall PC microprocessor revenue share by vendor, 3Q09 with 2Q09 and 3Q08 comparison
• Worldwide desktop PC microprocessor unit share by vendor, 3Q09 with 2Q09 and 3Q08 comparison
• Worldwide mobile PC microprocessor unit share by vendor, 3Q09 with 2Q09 and 3Q08 comparison
• Worldwide PC server microprocessor unit share by vendor, 3Q09 with 2Q09 and 3Q08 comparison
• Worldwide PC microprocessor overall average selling prices and unit shipments for 3Q07–3Q09

The accompanying Excel spreadsheet data file includes the results of IDC's quarterly PC microprocessor studies from 1Q07 to 3Q09 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 22, 2009.