Starbucks Corp. SBUX, -1.97% posted a letter on its corporate site from Chief Executive Howard Schultz to the company's workers on Monday that gives a sneak peek at big changes Schultz says are in store. "Today, we find ourselves in a position where we must modernize and transform the Starbucks experience in our stores and recreate an environment that is relevant, welcoming and safe, and where we uplift one another with dignity, respect and kindness.