Yahoo Backup Tool — Technical Specs

System requirements, supported formats and trial limit for Yahoo Backup Tool.

System Hardware & OS Support Matrix

Operating System Windows 11, Windows 10, Windows 8.1, Windows 7, Windows Server 2016-2025, macOS Sequoia (15), macOS Sonoma (14), macOS Ventura (13), Apple Silicon M1/M2/M3/M4, Intel x86-64

Processor / CPU See the download page for current requirements

Memory (RAM) See the download page for current requirements

Disk Installation Space See the download page for current requirements

Deep Architecture Specifications

Connection & Mailbox Compatibility

Connection Protocol Direct TLS 1.3 encrypted IMAP connection via imap.mail.yahoo.com (Port 993)

Authentication Standard Secure Yahoo App-Specific Passwords with SSL encryption

Folder & Label Mapping Downloads Inbox, Sent, Drafts, Trash, Spam, and all custom user folders

Output Formats & Export Options

Target Formats PST (Outlook Unicode), PDF (searchable with attachments), MBOX, EML, MSG, HTML, CSV

PST Output Splitting Configurable chunk sizing at 2 GB, 5 GB, 10 GB, or 20 GB thresholds

Data Privacy Processing runs on your computer. Data goes only to the mail provider or cloud destination you choose.

Supported Source & Target Formats

Input Source Formats (1)

YAHOO

Output Target Destinations (16)

PST PDF MBOX EML EMLX MSG HTML MHTML RTF DOC TXT JSON CSV GMAIL OFFICE365 IMAP

Free trial limit

50 items per folder

The free trial exports up to 50 items per folder so you can verify conversion fidelity before purchasing.

Download Free Trial

Test performance on your hardware with a 50-item preview export limit.

Download Trial Installer