Preparing the mail flow for the Office 365 migration

This article is part of my migration journey from my old Office 365 to my new Microsoft 365 Tenant. This article is about mail traffic during the migration and how to avoid data loss.

In May 2015 I have already written the article “Migration from one Office365 Tenant to another Office365 Tenant“. I will adopt and adapt the relevant parts from the old article here.

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