http://www.bbc.com/news/business-36484245 [bbc.com]
A Swedish court has ruled that the confectionery firm Mars can no longer advertise its M&M's brand with the lower case lettering - m&m. The court ruled that the logo is too similar to the single lower case "m" used by the Swedish chocolate covered peanut brand Marabou.
If Mars doesn't appeal it will have to use the capital M&M logo in Sweden starting in July. Mars said it believed "no confusion exists" between the two chocolates.