POP to Microsoft 365 Migration

• Emails, attachments, and dates are migrated via PST; if the PST contains local folders, these are preserved.
• POP does not store folders, permissions, rules, or signatures on the server. We document equivalents and recreate them in Outlook.
• Contacts and calendars can be imported via CSV/ICS if required.

1. Assessment and inventory of mailboxes, PST size, and dependencies.
2. Preparation of Entra ID, licenses, Outlook profiles, and DNS plan.
3. PST export and import into Exchange Online (Import Service / EAC).
4. Cutover performed overnight with end-to-end validations.
5. Post-cutover: reconciliation, guides, and support.

We reduce TTL, update MX during cutover, and configure SPF, DKIM, and DMARC for Microsoft 365. We test send/receive and monitor bounces to ensure full deliverability.

• Creation or update of the Outlook profile with modern authentication.
• Reconfiguration of mobile devices and recovery of signatures/local rules if they existed.

We mitigate this with prior communications, user guides, and onboarding support.

• Number of mailboxes and total PST size (GB).
• Bandwidth and export/import times.
• Data quality (corrupted PSTs, duplicates, oversized attachments).

We estimate timelines during the assessment and validate with a pilot before cutover.

• Corrupted PSTs or errors: repaired/segmented with controlled retries.
• Duplicates due to prior downloads: filtered and deduplicated during import.
• Incorrect DNS records: guided execution and end-to-end validations.

Once MX is validated to Microsoft 365 and imports are complete, the POP mailbox/service can be deactivated or the hosting canceled. We deliver a checklist and validation evidence before shutting down the legacy service.

MSAdvance exports mail to PST and ingests it with the Microsoft 365 Import Service (or EAC Import .pst). The process includes generating a SAS URL, uploading via AzCopy, mapping mailboxes, and starting the import job. Official guide: Use network upload to import PST files (Microsoft Learn) .

POP doesn’t support server-side folders, shared mailboxes/permissions, calendars, or contacts, and each device behaves independently. Exchange Online provides full mailbox features, shared access, and modern management. Reference: POP3 and IMAP4 in Exchange Online (Microsoft Learn) and Exchange Online service description .

Yes. As part of the project, MSAdvance creates or updates Outlook profiles and validates send/receive. Autodiscover handles configuration so users can sign in quickly. Background: How Outlook uses Autodiscover (Microsoft Learn) .

We include stabilization, incident resolution, final reporting, and brief training for Outlook and mobile devices, along with security and compliance (GDPR) recommendations in Microsoft 365.