Yahoo Backup Tool Frequently Asked Questions

Yahoo requires a dedicated App Password for IMAP access, not your regular password. How to create one

Yes. Prism exports directly to standalone Microsoft Outlook Unicode PST files compatible with Outlook 2003 through Outlook 2024 and Microsoft 365. The software runs locally on your workstation and does not require Microsoft Outlook to be installed.

Prism features an ACID-compliant SQLite Checkpoint Resume Center. Every downloaded message is recorded locally in real time. If your network drops or your computer reboots, simply reopen Prism and click Resume. The engine continues from where it stopped.

Yes. Under the Accounts screen, switch to the CSV Batch Import tab. You can provide a list of Yahoo email addresses and corresponding App Passwords in a standard CSV file, and Prism will process each mailbox in unattended sequential order.

Prism includes an automated PST auto-splitter in Step 4. You can configure split thresholds at 2GB, 5GB, 10GB, 20GB, or 45GB. When output crosses the chosen threshold, the engine automatically closes the current volume and creates a sequential new file (e.g. Yahoo_part2.pst) without slicing email threads in half.

Yes. Selecting PDF as your export format produces ISO 19005-1 compliant PDF/A documents. You can configure custom sequential Bates numbering (e.g. YAHOO-LEGAL-001001), set page numbering, expose full RFC 822 MIME headers, and embed binary attachments directly inside the PDF.

Yes. Prism preserves attachments, inline images, hyperlinks, formatting and folder hierarchies. Compare a sample in the free trial.

The free evaluation version allows you to connect your Yahoo account, scan all folders, browse mailbox messages, preview email bodies, and convert up to 50 items per folder so you can verify export speed and quality before purchasing a license.

No. Prism processes downloads locally on your workstation. Connections are established directly between your machine and Yahoo IMAP servers over encrypted TLS.

Yes. Step 3 includes an inclusive date range filter (00:00:00 to 23:59:59) with quick presets ('Last 7 Days', 'Last 30 Days', 'This Year', 'Last Year') as well as sender, recipient, subject, and attachment size filters.

Yes. Prism is distributed as a Universal Binary supporting macOS Sequoia (15), Sonoma (14), and Ventura (13) with native ARM64 compilation for Apple Silicon M1, M2, M3, and M4 processors.

In Step 4, choose Cloud Migration and select Microsoft 365 or Google Workspace. Authenticate via Modern OAuth 2.0 PKCE, and Prism will stream your Yahoo emails directly into your destination cloud mailbox.

Following successful payment, your digital license key is delivered to your billing email address. If you need your key resent or require assistance with activation, you can contact our team anytime via our Contact Support page.

We provide free evaluation versions for all tools so you can test compatibility and conversion fidelity on your own data before buying. If you encounter a verified technical limitation or defect that our engineering support team cannot resolve, purchases are covered under the terms detailed on our Refund Policy page.