Apple is trying everything to defend its App Store trademark. However, it looks like the company is about to lose its bid in Court against Amazon, as the judge announced that Apple had not proved yet the risk of confusion for consumers because of the use of the name App Store by Amazon (it seems absolutely evident to us). In the mean time, Amazon is resisting and still refuses to change the name of its online store. Microsoft is also taking part in the procedure to invalidate the trademark as it would like to use it as well.
On the other side, Apple keeps sending legal threats to whoever uses the name App Store. The last one that received one is a small company called Amahi.
Other companies got similar letters as they were using the name App Store. As a reminder, these letters are sent by law firms mandated by Apple, which get paid for every mission they complete, so it is not surprising to see that many letters going out to every single company using the name App Store.
By Machmeter, original by Lionel