Analyst Gartner has warned that, without a concerted effort by Symbian and its backers, Microsoft will sweep them aside in the smartphone business.
Redmond's ability to offer standardised handsets which are easier for businesses to support and use will help the software giant win corporate approval, the market watcher predicted.
Symbian, he added, needed to resolve a number of issues to be a credible, corporate alternative. Its platform and menus differ slightly on various handsets, which means that they often do not have the same user interface.
"This is unattractive for chief information officers. They need standard systems and that's what Microsoft will provide.
"If by the end of next year Symbian hasn't solved its problems, Microsoft will be a very strong competitor for a standard corporate smartphone.
"Symbian could lose the battle and at the moment I'd have to say it will probably happen."