Office 365 to Gmail Migration

I currently have a single-user Office 365 mailbox and I’m moving to Google’s email platform primarily to cut my monthly costs. I’ve already decided that only my recent messages need to come across, so the job is much smaller than a full archive transfer... (Budget: $30 - $250 USD, Jobs: Change Management, Documentation, IMAP, Office 365, Project Management, System Administration, Technical Support, Troubleshooting)