Nintendo and Microsoft may be competitors, but that hasn't stopped Nintendo from speaking out today to congratulate Microsoft on the Xbox's 15th anniversary.

Writing on Twitter today, Nintendo said, "Happy anniversary, Xbox! Congratulations on 15 fantastic years." The tweet is accompanied by a happy-looking Mario.

Happy anniversary, @Xbox! Congratulations on 15 fantastic years. pic.twitter.com/BjGHjZG11d — Nintendo of America (@NintendoAmerica) November 15, 2016

Nintendo apparently sent Xbox boss Phil Spencer a hard-to-find NES Classic before the console's launch last week. Microsoft Studios GM Shannon Loftis wasn't so lucky.

The original Xbox launched 15 years ago today, on November 15, 2001. The console was followed up by the Xbox 360 in 2005 and the Xbox One in 2013. Microsoft's next Xbox console, Project Scorpio, is slated to come out in holiday 2017.

Microsoft is celebrating the Xbox's birthday today by giving away DLC in Halo 5 and Forza Horizon 3. The company also has a pretty cool Snapchat story today, featuring a behind-the-scenes look at the Xbox and the people who made it. Add "Xbox" on Snapchat to see the video.

Nintendo's next console, the Nintendo Switch, is scheduled to debut in March 2017. Nintendo will announce the console's price, specs, and launch lineup in January. Just today, it was reported that The Legend of Zelda: Breath of the Wild may miss the console's launch, with a Mario game taking its place.