migration of email account from hosting site Hostinger to Microsoft 365

Dear @Scott Lai,

Thank you for posting your question in the Microsoft Q&A forum.

I understand that you are planning to move to Microsoft 365 Business Standard, and I'd love to give you some helpful information. Below are answers to your questions and some guidance to help you plan the migration:

1. Is it possible to migrate email account from a hosting site (Hostinger for our case), to Microsoft 365 email?

• Yes, you can. Because Hostinger provides IMAP access, you can use Microsoft’s native IMAP migration in the Exchange admin center (EAC) to bring users’ existing mail into Exchange Online.
• The Microsoft Learn guide walks through the process end‑to‑end (identify your current IMAP server, build a CSV of users, create a migration endpoint, and run batches), please visit:
  • Migrate other types of IMAP mailboxes to Microsoft 365 or Office 365
  • IMAP migration in the Microsoft 365 admin center
• Note: IMAP migrations move email only (not calendars, contacts, or tasks). If you need those, you’ll either export/import them per user (e.g., from Outlook) or use a third‑party tool. Microsoft explicitly documents this limitation. For more information: What you need to know about migrating your IMAP mailboxes to Microsoft 365 or Office 365

2. Is there a support team can help or provide service to setup and configuration for domain connection and email migration?

Based on your description, Microsoft provides 2 levels of help, depending on license count and preference:

• Microsoft Solutions Partners (paid, hands‑on): If you’re under 150 seats or want someone to execute the work end‑to‑end (including calendars/contacts, client reconfiguration, change management), use the Find a Microsoft partner directory to locate a local Modern Work partner who does Microsoft 365 migrations. For reference: Microsoft partner
• Self‑serve Microsoft support & guides:
  • Step‑by‑step admin guides for adding your domain and DNS (MX/SPF/DKIM/Autodiscover) are available and include contact routes to Microsoft support from inside the admin center. Add DNS records to connect your domain and Gather the information you need to create DNS records
  • You can also contact Microsoft Support for better support and guides, visit: Get support | Microsoft Docs   

3. Is it difficult to self manage for a migration of total about 100 account / user? is there a tools can help or assist on this for batch migration?

It’s manageable with planning, if you plan it in batches and keep users informed. For ~100 IMAP mailboxes:

• Native option (no extra cost): Use the EAC IMAP migration wizard. You’ll upload a CSV and run batches (e.g., 15–25 accounts at a time). The wizard handles initial and incremental syncs until you cut over.
• Microsoft’s guidance notes typical IMAP limits (e.g., max 500k items per mailbox; 35 MB item size; email only), and it recommends relaxing any connection throttles on the source to improve throughput. For more information, please look through: What you need to know about migrating your IMAP mailboxes to Microsoft 365 or Office 365

I hope this information is helpful. If you have any other questions please feel free to reach out

Thank you for your patience and understanding. I'm looking forward for your reply.

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