In 2024, De Beers wanted one email archive. Mimecast was the destination. The history was still in Proofpoint: 55.4 million emails, totalling 6TB.
Running both platforms was costly and awkward. Unlocking Mimecast meant moving that archive without disrupting the business. The Possibility Partnership took the brief and ran the migration with eMXport.
Why the old archive was still there
De Beers wanted Mimecast’s archiving and security features. The legacy data had not moved, so the old platform stayed in place, with the cost and the management that came with it.
The job was to migrate 55.4 million emails securely, keep a clear chain of custody, and avoid a migration that the De Beers team had to operate themselves.
A managed move, with nothing to install
eMXport is cloud-native. De Beers did not have to provide hardware or compute, and did not inherit a migration platform to patch.
The team handed over the brief. We managed the Proofpoint to Mimecast work end to end, including the traceability the engagement required.
What changed afterwards
The published result was 55.4 million emails and 6TB moved, with chain of custody maintained and no impact on business as usual. Archive management sat on one platform. The case study also reports savings from retiring the legacy system.
The Possibility Partnership took complete ownership of our email migration, delivering exactly as promised—secure, compliant, and with zero disruption. Their cloud-native approach made the process effortless for us and ensured we could unlock the full benefits of Mimecast from day one.
Tony Gaffney, IT Systems Manager, Infrastructure Operations, De Beers
If an old archive is still in the budget because the data has not moved, that is a migration to scope, not a renewal to accept. Tell us the source, the destination and the rough size.