How to fix conflicting accounts.
Outlook:
How to migrate contacts, calendars, and email from Outlook
Contacts:
How to migrate contacts from Gmail to G Suite
How to migrate contacts from GPLS Email to G Suite
How to migrate contacts from Outlook to G Suite
How to migrate contacts from Rackspace to G Suite
How to migrate contacts from WorldClient to G Suite
How to migrate contacts from Dreamhost to G Suite
Calendars:
Transfer ownership of Google calendars to your new Google account
Export calendar from Outlook and import into Google
Export personal Google Calendars
Sites:
Google Drive Files:
Download all files, then upload them to the new account
If you need to keep the sharing and collaboration connections created by your old account, simply share all the files to your new Google account. If you want those shared files to sync to your desktop, add them to your drive. You can also transfer the ownership of all files from the old account to the new one.
Archiving/backups:
How to export data from a Google account