Microsoft added to its Office 365 roadmap last week mention of a coming Google G Suite to Office 365 "migration experience." The offering is in development and will be ready by Q2 calendar 2019, according to the roadmap.
Here's the roadmap entry, in full:
"We've heard the feedback and we're excited to announce the new G Suite migration experience which will allow you to directly migrate email, calendar and contacts from Google G Suite to Office 365! Our highly secure solution ensures your data is directly migrated to Office 365, with no resting points along the way. We're also adding support for migrating mailbox in batches."
Read more: Microsoft is working on a Google G Suite to Office 365 migration toolset | ZDNet
See also: Office 365 Weekly Digest | November 4 - 10, 2018 Office 365 Weekly