The migration is now complete. The status is green. The real work now begins. Most teams aren’t monitoring the right things during the first 72 hours of migration.

1. Verify that the desktop, mobile, web, and Exchange Online clients are all connected. The first failures are due to legacy Outlook profiles, and mobile device enrolling.

2. Verify inbound/outbound routing with the new records. Messages waiting in legacy connectors and those silently rejecting messages will not make themselves known.

3. Spot-check shared mailboxes immediately. They do not always transfer over correctly from the output of the migration tools, and the users that notice are rarely very patient.

4. Confirm OneDrive and SharePoint access. Verify site permissions for migrated Users. ShareGate migrations involving custom permission levels need manual validation. Assume the need for it until it is confirmed otherwise.

5. Teams membership and channel accessibility. Verify that users can access Teams, see the channel content and reach SharePoint-backed Files within Teams channels. These dependencies break sequentially.

6. Tracking help desk ticket volume can tell you whether an issue is systemic or isolated. At one project, we analyzed escalation pattern across 500+ customers during Hyper Care in order to distinguish between remediable exceptions and signals that require broader interventions.

A Hypercare monitoring plan can make the difference between a migration closing cleanly and one that takes weeks to remediate.

Cutover is the moment when the migration is complete. Hyper Care is a test to see if it worked.

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