Microsoft Windows servers showed positive growth as revenues grew 6.9% and unit shipments grew 9.8% YTY, according to IDC. Quarterly revenue of $5.7 bln for Microsoft Windows servers set an all-time high for a single quarter and represented the single largest revenue segment in the server market with 36.6% of overall quarterly factory revenue. Unix servers experienced 1.5% revenue growth YTY when compared with Q4 2006. Worldwide Unix revenues were $5.2 bln for the quarter, representing 33.3% of quarterly server spending and reflecting continued IT investment in this server market segment, with particular strength in the midrange enterprise segment of the Unix market which comprises 53.8% of all Unix spending. Linux server revenue reached $2.0 bln for the first time in any single quarter on 11.6% YTY growth. Linux servers now represent 12.7% of all server revenue, up more than 1 point over Q4 2006.