To write effective emails to coordinate a cross-company innovation challenge, consider the following best practices:

1. Clear and Concise Communication: Clearly outline the purpose of the challenge, objectives, themes, submission deadlines, and prizes in a concise manner.

2. Engaging Subject Line: Use a compelling subject line that grabs attention and communicates the importance of the email. For example, “Join Forces for Innovation: Cross-Company Challenge Inside!”

3. Personalization: Address recipients by their names and personalize the content to resonate with participants from different departments.

4. Highlight Benefits: Clearly communicate the benefits of participating in the challenge, such as driving company success, fostering creativity, and showcasing talents.

5. Call to Action: Include a clear call to action that encourages employees to collaborate, submit their ideas, and engage in the innovation challenge.

6. Provide Resources: Offer support, resources, and guidelines to help employees prepare and submit their innovative ideas effectively.

7. Deadline Reminders: Send timely reminders about submission deadlines to keep participants engaged and motivated.

8. Follow-Up: Follow up with regular updates, progress reports, and encouragement to maintain participation and enthusiasm.

9. Acknowledge and Reward: Acknowledge the efforts of participants, provide feedback on submissions, and reward innovative ideas to motivate further engagement.

By following these best practices, you can effectively coordinate a cross-company innovation challenge through well-crafted emails that inspire collaboration, creativity, and success.