idc 的报道
http://www.idc.com/getdoc.jsp?containerId=prUS23974913Top Server Market Findings
Linux server demand was positively impacted by high performance computing (HPC) and cloud infrastructure deployments, as hardware revenue improved 12.7% year over year in 4Q12 to $3.0 billion. Linux servers now represent 20.4% of all server revenue, up 1.7 points when compared with the fourth quarter of 2011.
Microsoft Windows server demand continued to increase in 4Q12 as hardware revenue increased 3.2% year over year. Quarterly revenue of $6.7 billion for Windows servers represented 45.8% of overall quarterly factory revenue, the same share as in the prior year's quarter.
Unix servers experienced a revenue decline of 24.1% year over year to $2.6 billion representing 17.6% of quarterly server revenue. This was the sixth consecutive quarter of revenue decline in the Unix server market and all major Unix server vendors experienced a revenue decline when compared with the fourth quarter of 2011.
After five consecutive quarters of revenue declines, IBM's System z mainframe running z/OS increased revenue 55.6% year over year to $1.8 billion, representing 12.3% of all server revenue in 4Q12.
其实windows在企业市场优势还是非常明显的，只不过这部分社区不活跃人员也比较低调。另外linux用的多的像google都是自己造服务器，一定程度上也提高了windows在销售服务器中的比例。