Nokia will ship its final Symbian handsets this summer and formally put all its eggs in the Windows Phone basket.

The Financial Times said the Finnish phone maker is not expected to announce that Symbian shipments have stopped as to not affect the sales of existing stocks of Symbian phones.

Nokia announced its final Symbian phone, the 808 Pureview, in 2012. Since then it has been busy with the Windows Phone platform as well as its own Asha platform for low-cost devices. The company’s new flagship smartphone, the Lumia 925, will see a U.S. release on T-Mobile and maybe AT&T as well. Meanwhile, the company has been rolling out Asha phones like the 210 in order to gain back market share in emerging markets.

In the U.S., the once-mighty Symbian has seen a steady decline since 2007. In Comscore’s latest numbers, the operating system held just 0.5 percent of the U.S. smartphone platform market share. 

But Windows Phone has made better headway. According to Kantar Worldpanel ComTech’s latest numbers, Windows Phone increased U.S. market share from 3.7 percent in the first quarter of 2012 to 5.6 percent in the first quarter of 2013. Meanwhile, Apple’s iOS dipped .9 percent from 44.6 percent to 43.7 percent.