Migrations that fail are rarely technical failures. They are projects where management promised “the same thing, but European” when some of the uses could not follow. This first block sets what goes, what stays, and what the teams are told.
The inventory determines the quote and the schedule. Every item forgotten here comes back later as rework, often at the worst moment. Applications that send mail are the most frequent gap: a copier or payroll software that keeps sending with the old credentials only shows up after the cutover.
The target is prepared while employees continue to work on Microsoft 365. The MX does not move. This phase is used to find problems on a sample, while there is still time to correct the method.
The day before is used to reduce the gap between the two platforms to a minimum. Without a second pass, the last days of mail are missing. Without a freeze, an alias created that evening exists on only one side.
Cutover day is judged on external evidence, not on the fact that “it works internally”. A message sent from an outside personal mailbox must arrive on the new platform within the TTL; a real outgoing message must pass SPF, DKIM and DMARC at a recipient.
The migration is not finished when the MX has been switched. It is finished when only one world sends mail, the discrepancies have been dealt with and a restore has been tested on the target. Shutting off sending on the old platform prevents an employee from replying from two places.
The step-by-step method is in migrating without downtime. The general order of operations and what does not transfer are in migrating from Microsoft 365 to a European solution.
An internal lead, with an owner and a date on each line. The provider can carry out a large part of it, but validating the sample, the exclusions and the completion criterion is the company’s responsibility.
No. The tool copies; it does not check that management’s shared mailbox or the recurring appointments have arrived correctly. The sample is the moment when the method is corrected at the lowest cost.
Long enough to check that no flow still uses it and that the discrepancies have been dealt with, in read-only mode. Set the closing date in advance and record it, so as not to pay for two platforms for no reason.
For the most part, yes: inventory, DNS, copy passes, sending applications, rollback. The points specific to Google (labels, Drive file owners, groups) are described in migrating from Google Workspace.
For an email migration to Klytic: free advice, no email lost, migration carried out by Klytic on a quote basis. The subscription and the migration are two separate invoices; subscription prices are on the Pricing page.
This page describes a checklist. It does not replace the inventory of your tenant or the cutover plan written with your provider.
Free advice, no email lost. A migration carried out by Klytic is quoted after an inventory.
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