Microsoft surprised market observers a bit on Monday with the announcement of its first non-Nokia version of the Lumia smartphone, the Lumia 535, a day earlier than anticipated.

Microsoft bought out Nokia’s mobile business seven months ago, and continued to use Nokia branding on its Lumia 730 and Lumia 830 releases since then. Lumia 535 will be the first to completely ditch the Nokia name.

Microsoft paid $7.2 billion for Nokia back in April, according to CNET, and although early on the software giant wanted to keep leveraging Nokia’s brand, its long-term vision is to make Lumia a truly Microsoft product.

The smartphone runes on WIndows Phone 8.1 software, which is the latest version of Microsoft’s mobile operating system. It is considered the sequel to Lumia 530 and is aimed at the lower end of the market.

It will include a 1.2GHz Qualcomm Snapdragon 200 quad-core processor, and a 5-inch 960×540-pixel display. In terms of hardware, it will have a plastic back with rounded corners in a slimmer frame.

It won’t revolutionize smartphones, and Lumia has struggled to win buyers on the market, but Microsoft is hoping to revitalize the brand. The software behemoth is, after all, itself struggling to push its Windows Phone platform as Google’s Android operating system has continued to dominate the market, running on 85 percent of mobile devices across the globe.

The phone market hasn’t been an especially profitable one for Microsoft, as restructuring costs that came from the company’s acquisition of Nokia has put a dent in the latest financial results despite sales of 9.3 million Lumia phones in the last quarter, a 5.6 percent increase from the same time last year.

Lumia was first introduced in November 2011, and resulted from a long-term partnership between Nokia and Microsoft. Nokia had been the largest vendor of mobile phones worldwide between 1998 and 2012, and its Symbian platform was the host for most early smartphones, but its market share plummeted in recent years as touchscreen smartphones have proliferated, especially Apple’s iPhone and Google’s Android-based products.

In 2012, Samsung passed Nokia as the biggest worldwide vendor. In response, Nokia allied with Microsoft to regain market share, and then eventually sold itself off to the company.

It was in 2011 when Nokia and Microsoft first announced their business partnership. The Windows Phone operating system was to replace the Symbian system Nokia had relied on for many years. The deal also included making the Bing search engine as the standard search engine on Nokia phones.