Migrate to Microsoft 365
4TH AND BAILEY has migrated over 133,675 email items and 33.64 GB of data in a single engagement with zero downtime and 99.996% item-level accuracy. Email migration is not technically complex — it is operationally complex. Getting it wrong means lost data, disrupted workflows, and user trust that is difficult to rebuild.
Every migration begins with a pre-migration audit: mailbox inventory, size analysis, special folder identification, shared mailbox and distribution list mapping, and a cutover plan that minimizes disruption to business operations.
Migration source systems supported include on-premises Microsoft Exchange (all versions), Google Workspace (Gmail), IMAP-based email systems, Microsoft 365 tenant-to-tenant, and hosted Exchange platforms.
Post-migration, every Exchange Online deployment is configured with CISA SCuBA anti-phishing baselines, DMARC/DKIM/SPF alignment, and Exchange Online Protection tuning before users are cut over. Mail flow is verified before the source system is decommissioned.
What is included
- Pre-migration mailbox and data audit
- Migration project plan and cutover schedule
- Source-to-destination data migration (email, calendar, contacts)
- Shared mailbox and distribution list migration
- DMARC/DKIM/SPF DNS configuration
- Exchange Online Protection and anti-phishing configuration
- User communication and cutover guidance
- Post-migration verification and issue resolution