FBR estimates that ARM-based micro servers will be attributed to more than a half of overall micro server market (ARM and x86) resulting in more than $1.2B market size in 2018. Overall micro server market will boom due to high demand on web-centric servers and will capture up to 10% of overall server market. Later will be growing at CAGR of 5% till 2018:
On the other hand ARM-based PCs will capture approximately 10% of market.
For more details check full article.Based on: http://blogs.barrons.com/techtraderdaily/2013/12/12/arm-holdings-fbr-starts-at-buy-on-microserver-promise/