Migrating multiple mail adresses from ovh to google workspace (gmail)

Hello there,

So we have google workspace for my organization, I have a dozen email adresses I want to migrate from OVH to google. I have created all the users in google workspace, and set up the MX records. Email do drop in gmail now, works fine.

My issue is on importing the existing stuff : emails, contacts... I can't quite figure out how it's done. Ideally I would want to do it once and not on per user basis (that one I found how to do it).

How should I proceed ?