HELSINKI (Reuters) - Nokia's head of mobile networks, the division which accounted for more than half of Finnish telecom network equipment maker's sales last year, is leaving the company.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=5IR6Mnl211M:dKZX0bVLAKo:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=5IR6Mnl211M:dKZX0bVLAKo:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=5IR6Mnl211M:dKZX0bVLAKo:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=5IR6Mnl211M:dKZX0bVLAKo:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=5IR6Mnl211M:dKZX0bVLAKo:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/5IR6Mnl211M" height="1" width="1" alt="" />