Writing in a blog post, Nick Jones, analyst at Gartner, said, "Any alliance between Microsoft and Nokia around WP7 would be complex. There are opportunities for synergy, but both sides would have to trample on some of their dreams to make it work. I'm not sure that either is desperate enough yet for the optimum deal to emerge."
Jones suggested for a deal to emerge, the two ecosystems would have to converge and "abandon cherished strategies". This would mean supporting Navteq maps and Qt on WP7 instead of Silverlight as well as opening up WP7 to Nokia developers and the Ovi app store. "That would be a lot for Microsoft to swallow," he said.
But Jones believes an alliance might improve the acceleration of the Symbian user experience as well as forming a partnership "as scary as Google".
Microsoft and Nokia launched a joint application earlier this year as part of its mobile productivity alliance, which envisaged a suite of Microsoft products such as Word, Powerpoint and Excel on the Nokia E-Series phones to challenge Blackberry manufacturer, Research in Motion.
Nokia declined to comment on the rumour.