Microsoft dominated PCs and Nokia mobile phones, but both are irrelevant in the dominant model for tech in the next decade, smartphones and tablets. An acquisition may have been necessary, but by itself it solves nothing.

Smartphones are now half of all mobile phone sales, and the 255m smartphones and tablets sold in Q2 2013 dwarf the 76m PCs sold. Microsoft now powers less than a quarter of all the personal computing devices being sold.

Microsoft retains a leading position in enterprise and in console gaming. But if it cannot return to relevance in consumer, the strength of the whole business will suffer.

Smartphones are rapidly moving to become a majority of UK mobile handset sales, driving a surge in mobile internet use. Even if usage per user (currently growing) flattens out, we forecast mobile internet usage to grow from 1.8bn hours in 2010 to 7bn in 2015: 28% of total online time

This should drive the long promised growth in mobile advertising and we project UK spend, including search and display, will rise to £420 million by 2015, equivalent to 10% of PC internet search/display advertising

We expect the majority of this usage to be incremental to PC-based consumption, as users find new things to do and buy on the mobile web, driving the overall online advertising market to further growth

By 2015 we expect internet-centric smartphone penetration in the UK to reach 75% and mobile internet use to reach 28% of total time spent online. The dynamics and ecosystems of the mobile internet, and in particular the app model, will become a significant part of overall digital strategies

First seen as an interim reaction to slow networks and small screens, mobile apps have become a major new route to market for publishers and ecommerce providers, and are likely to spread to new areas

However, Apple is likely to continue to lose share in the internet-centric smartphone market, and publishers will face a far messier, fragmented world of competing platforms, app stores and payment systems