# Migrations and legacy e-mail client applications

> Find out why older email apps may stop working after a server change or migration, and how to update or replace them.

Source: https://helpcenter.ruachost.com/email/email-setup/migrations-and-legacy-e-mail-client-applications/

When migrating to modern e‑mail platforms, customers may encounter issues with **legacy e‑mail client applications**. These older clients often lack support for current security standards and may require adjustments or replacements to ensure smooth operation.

## Why Legacy Clients Are a Problem

- Many older e‑mail clients do not support **modern TLS protocols**.
- They may fail to connect after server upgrades.
- Legacy clients often lack support for **OAuth2 authentication**, relying instead on outdated password methods.
- Using them can expose accounts to security risks.

## Migration Considerations

1. ### Identify Legacy Clients

   - Examples: Outlook 2007, Windows Live Mail, Eudora, Thunderbird (older versions).
   - Check compatibility with current Ruachost mail servers.
2. ### Update or Replace Clients

   - Upgrade to the latest version of your preferred e‑mail client.
   - Consider modern alternatives like Outlook 365, Apple Mail, or Thunderbird (latest release).
3. ### Reconfigure Accounts

   - Use **IMAP** instead of POP3 for better synchronization.
   - Ensure SSL/TLS is enabled for incoming and outgoing mail.
   - Update SMTP authentication settings to match Ruachost requirements.
4. ### Test After Migration

   - Send and receive test messages.
   - Verify folder synchronization and calendar/contact integration.

> **Note:**
- Legacy clients may stop working entirely after server security updates.
- Customers should plan migrations proactively to avoid downtime.
- Ruachost support can assist with configuration but may not troubleshoot unsupported legacy software.