​How are contacts field mappings handled when migrating from G Suite?

Answer:

• Contacts handling – the default behavior is to skip suggested contacts.
• An Advanced Option can be set to migrate suggested contacts instead.
• All contacts are migrated to the contacts system folder of the Destination.
• Folders from the Source are recreated on the Destination to match the Source.
• Migration of all properties with the following exceptions (these exceptions are due to Exchange limits):
• Migration of up to three email addresses
• Migration of up to one of each phone category
• Migration of up to one of each address category
• Migration of up to one anniversary
• Migration of up to one birthday
• Migration of up to three instant messaging categories
  
  Note: Technically, Exchange supports up to three IMs without category; however, the most recent UI displays only one.
• Migration of up to one person in each of the following categories: spouse, partner, manager, domestic partner, child, assistant
• Migration of photos appear as attachments to Exchange 2007
  
  Note: Technically, a photo is an attachment, but after the migration it shows up as the contact’s photo.
• Do not migrate custom fields
• Do not migrate groups
•  G Suite contact fields that are populated by Google Directory services are not migrated.