If you have previously opted-in to personalize your Microsoft SwiftKey Keyboard from third party services such as Gmail or Twitter, Microsoft SwiftKey will retain this data and your personalized language model will remain the same.
Your Microsoft SwiftKey Keyboard will continue to learn the words and phrases that matter to you as you type. It doesn’t matter what you’re typing; be it a Tweet, a Facebook status, SMS message, or email, Microsoft SwiftKey will continue to learn and personalize your language model appropriately. However, please remember this excludes passwords, credit card numbers and other sensitive information.