Microsoft 365 mail transportation process; It includes selecting the appropriate migration method to the source system, preparing target accounts, pilot transfer and verifying mail forwarding. When migrating to Exchange Online, not only the scope of email but also calendar, contacts and access rights should be determined.
How does IMAP migration differ from other methods?
IMAP can be used to move messages in mail folders; It should not be assumed that contacts, calendars and tasks are transferred in the same process. Exchange or Google Workspace resources may have different migration options. The source version, identity structure, and need for interoperability change the method.
Technical reference: Microsoft Learn — Scope of IMAP migration.
Method comparison: Microsoft Learn — Email migration methods.
What should be ready on the Exchange Online side?
Domain ownership and required target accounts must be verified. The license requirement is controlled by the type of migration to be used. SMTP submissions of public boxes, groups, aliases and applications should be kept in a separate checklist.
The person who will grant access authorization, the validity period of the access, and how it will be removed at the end of the process must be determined. Accessing account Microsoft 365 does not automatically grant access to all boxes on the old system.
Which users should be in the pilot group?
Don't just create pilots from small, trouble-free boxes. Choose different scenarios such as large mailbox, shared calendar, mobile usage, and team address. Compare the transfer report with the user's daily workflow.
Example scenario: although messages are transferred, the assistant's access to the manager's calendar does not work. Even if the number of folders appears successful, functional acceptance is not complete. This is not an example customer result.
How to manage live migration and acceptance?
- Announce transition time and user information in advance.
- Keep track of DNS, authentication, and app push settings in the same changelog.
- Test import-send, Outlook/mobile access and necessary sharing.
- Report incorrect or omitted data; Do not close the old service early.
- Remove temporary administrator access at the end of the job.
with your source platform and user needs Microsoft 365 management You can request a transition evaluation within the scope of
Related resources
For application and enterprise support coverage Corporate Mail Transport Service You can review the page.
Official sources
Technical documentation and legislation may change; The relevant version and current text should be checked before application.
Frequently Asked Questions
How long does transportation take?
Data volume, limitations of the source system, connection conditions, and method affect the time. An exact time should not be given without a preliminary examination.
Do old archives automatically move to the new archive?
This depends on the migration tool and target storage structure. Archive scope and license should also be verified.