Sustaining the growth momentum achieved last year, the domestic IT industry is likely to grow 21.7% in 2005, becoming the fastest-growing market in the Asia-Pacific region, International Data Corporation (IDC) India said today.IDC India, which gave top 10 predictions relevant for the Indian ICT market for 2005, said Vietnam and China will be ranked second and third in growth. The growth rate will be the lowest in Japan at 1.8%, it said."The growth in 2005 comes on the back of rising corporate profits, improvement in macroeconomic parameters (both globally and domestic) and heightened business confidence," the research firm said.With mobility, convergence and IT management driving growth in 2005, the high growth categories in 2005 will be notebooks, smart handheld devices, inkjet MFDs, security software, network and system management software, information access and delivery software, and outsourcing."All the above categories will witness more than 30% growth over 2004," IDC India said.