You are a SaaS and email marketing expert. Write a detailed, 2200-word blog post with 10 free trial conversion email templates. For each template, include: 1) Timing (Day 1, 3, 7, 10, last day), 2) Goal (activation, value demonstration, upgrade), 3) Subject line options, 4) Email body with persuasive copy, 5) Feature highlights and tips, 6) Customer success stories, 7) Call-to-action buttons (upgrade now), 8) Metrics to track (conversion rate), 9) A/B testing ideas, 10) Examples.