cPanel and Webmail Email and website migration (approx 20 email accounts)

I need an experienced specialist to complete a full-scale email migration for a small team: a total of 11–50 individual mailboxes. Each account must be transferred with all existing messages, folders, attachments, contacts and, where available, calendars intact... (Budget: £20 - £250 GBP, Jobs: Account Management, Change Management, Data Protection, Documentation, IT Project Management, Project Management, System Administration, Technical Support)