1) Nokia struggled in recent years in the smartphone market but still has a strong brand perception among non-smartphone users. It launched the Lumia series of Windows phones in an effort to compete with Android and iOS devices.
2) Microsoft acquired Nokia's mobile phone business to strengthen its position in the smartphone market and benefit from Nokia's understanding of hardware design and global carrier relationships.
3) For Microsoft to succeed, it will need to heavily market the Windows phone platform and Lumia devices to improve consumer awareness and change perceptions that they cannot compete with Apple and Samsung. Whether it phases out the Nokia brand name remains unclear.