Migration G Suite for Office 365

[Andre Luiz Silva]

What is the best way to migrate G Suite accounts to Office 365?

Including the Google drive for Office 365. Approximately 500 accounts

Is third party tool required?

[#2]

There are 3rd party tools but why not check out FastTrack for Office 365 first, which I think you might qualify for, though do double check the eligibility. This is a no-cost option for qualifying organizations, where Microsoft offers a migration service:

"Mail can be moved to Exchange Online from on-premises Exchange Server, IBM Domino, Google Apps for Work, Novell GroupWise, or IMAP-capable systems. Files can be moved to OneDrive for Business from Google Drive, Box, or file shares and to SharePoint Online team sites from file shares. OneDrive for Business migration from a single G Suite environment (Google Drive only)."

FastTrack for Office 365

FastTrack Center Benefit for Office 365

Data Migration

Also, there is a new offer that might be worth checking out (for new OneDrive/Office 365 customers only):

Make the switch to OneDrive

[#3]

Agree with Cian here: FastTrack is a good option to move from Google to Office 365. I have worked on some projects where FastTrack Team has made the migration and in general the experience is good when talking about GMail migration...not as good when talking about GDrive migration

[#4]

@Andre Luiz Silva 

if you're looking for some best practices for the migration, this article might be able to help you: G-Suite to Office 365 Migration