I wouldn't portray the uncertainty customers face with such a jovial note. Acquisitions are notorious for shutting down service and products that customers depend on. There's nothing he says that would lead me to think that this is any different from thousands of other companies that have said the exact same kind of thing and ended up shutting down their service quickly after. I worked at a startup that was acquired and did this. In this context, there is nothing you can trust about a "Good news everyone..." acquisition letter from a CEO.