The researchers at International Data Corp. (IDC) released their latest worldwide server market share data this week. As was true in the last quarter of 2009, Windows servers are far and away the leader in share as measured by of percentage of revenue, the firm found.
While Windows' share was up slightly, to 42.1 percent of server OS share by revenue, Linux was also up, reaching 17 percent in Q4 2010, according to IDC. Unix's share was down, hitting 25.6 percent share, IDC said.
The fast-rising star in the server OS space was IBM's z/OS mainframe operating system, IDC reported. A year ago, IDC didn't break out z/OS's share by revenue, but in the last quarter of 2010, that number was 11.3 percent.
Here are the IDC breakouts:
Server OS share (by percentage of revenue) for Q4 2010
Server OS share (by percentage of revenue)for Q4 2009
z/OS (not available) Linux 14.7 Windows 41.6 Unix 29.9
IDC noted that factory revenues for the fourth quarter of 2010 were up 15.3 percent year over year, to $15.0 billion. Shipments for Q4 2010 hit 2.1 million units. IDC said Q4 2010 marked the highest quarterly revenue in the server market in three years.