Huawei has been selected as the smartphone partner for Microsoft's 4Afrika Initiative, launching the first Windows phone that targets Africa.
Microsoft is trying to lift its stock price by boosting its dividend by 25%, the largest increase since the company started its quarterly payments.
Microsoft says it will offer Windows users the choice to switch to a different web browser, in an attempt to appease European regulators.
Microsoft on Monday warned of a flawed software in Internet Explorer that hackers can exploit to take over some computers.
Chinese internet users have expressed fury at Microsoft's launch of an anti-piracy tool targeting Chinese computer users.
Most Windows users will welcome the introduction of the new operating system, Vista.