A Microsoft employee who tweeted about an unreleased Windows phone no longer works for the company.

Joe Marini had been the principal program manager for the Windows Phone team, and tweeted what appeared to be his impressions of an unreleased phone.

“I just got a chance to try out one of the slickest looking #Nokia phones I have ever seen. Soon, you will too!” the tweet read.

Marini expanded on that tweeting: “Overall I would say an 8. Solid feel, good camera, responsive UI, and nice little touches on the body construction.” This was in response to a question asking him to rate the phone out of ten.

Geekwire, which broke the story, reports that Marini resigned after learning that he was about to be let go for improper use of social media. The website cited sources “inside the company”.

A Microsoft spokesperson said: “We routinely do not discuss personnel matters, but I can confirm that Joe Marini no longer works at Microsoft.”

Nokia has said that its first Windows-based phone will be released this year.