<p>BOSTON (Reuters) - IBM will unveil a new version of its iconic mainframe computer on Tuesday, adding new security and data analytics features as it struggles to stem declines in the sluggish market for high-end business computers.</p><p>International Business Machines Corp is the dominant provider of mainframe computers, selling machines that run on powerful microprocessors of its own design and priced starting at about $1 million. Its chief competitors are high-end servers from Hewlett-Packard Co and Oracle Corp.</p><p>IBM said it spent more than $1 billion developing the updated machines, focusing on efforts to boost their computing performance, capacity and features.</p><p>Analysts said existing customers are likely to appreciate the new bells and whistles. But they cautioned it will be tough for IBM to win new clients as most businesses are already enamored of cheaper technology that is widely considered "good enough" for all but the most mission-critical tasks.</p><p><a href="http://www.reuters.com/article/2012/08/28/us-ibm-mainframe-idUSBRE87R03S20120828">Keep reading...</a></p>