The Black Eyed Peas star has claimed the tech giant has imitated his BUTTONS set released in 2016, after they unveiled their Surface Earbuds on Wednesday (02.10.19).
The talent show judge says it "hurts" and slammed the firm as "culture" thieves.
The 'Where Is the Love?' hitmaker also suggested Microsoft took his ideas after he showed them his prototype in 2015.
He tweeted: "This hurts...An African American start up struggling to inspire innercity kids with tech, only to find a GIANT steals our individuality & differentiation... #GetYOURownSTYLE your so 2000&LATE #cultureTHEFT...@Microsoft remember when I showed you our #BUTTONS 4years ago? (sic)"
Will also claimed he and Microsoft were planning to "collaborate".
He later added: "When you meet with a big company in hopes to collaborate with your big dreams & ideas, on how tech Should speak to & from inner city to inspire inner city kids to take an interest in tech...and 4 years later that company copy's the design and product you made is just sad... (sic)"
Will started his tech startup i.am+ in 2013.