This migration is best suited to email accounts containing extremely sensitive information (HIPAA compliance, company trade secrets, etc.), up to 100 seats. Includes security and sensitive data audits by a contracted security researcher after migration to new email solution. Upper limit on storage for each account is 25GB. Storage overage fees are $20 per additional 25GB. User accounts numbering over 100 seats are $60 per user starting at user number 101 and beyond.