IBM Smart Cloud is reaching end of life on July 15, 2020. If you have have an urgent need to migrate your mailbox data consider CloudM Managed Migrations
CloudM Migrate is able to migrate IBM Smart Cloud mailbox data to G Suite or Office 365, but it can be operated in both hybrid and cloud-only setups and the configuration and migration methods used can vary depending on the setup.
There are two options for migrating cloud-only IBM Smart Cloud mailboxes:
1. Replicate cloud mail files and migrate as Lotus Notes Archives
2. Migrate mail using IMAP