# MailsDaddy > MailsDaddy (Mails Daddy Software PVT LTD) is a Windows-based email migration, conversion, backup, and recovery software company headquartered in New Delhi, India. It provides desktop tools for IT professionals, system administrators, and everyday users who need to convert, migrate, repair, or back up email data across formats and platforms. All MailsDaddy products are Windows desktop applications. Free demo versions are available for all paid tools; demos export the first 20 items per folder. Full export requires a paid one-time license (Personal, Business, or Enterprise tiers). No subscription required. - Website: https://www.mailsdaddy.com - Products: https://www.mailsdaddy.com/products.php - Support: https://www.mailsdaddy.com/support.php - Contact: https://www.mailsdaddy.com/contact-us.php - Blog: https://www.mailsdaddy.com/blogs/ - Offers: https://www.mailsdaddy.com/offers.php --- ## What MailsDaddy Does MailsDaddy specializes in email data portability. Its tools solve four categories of problems: 1. **Email Format Conversion** — Converting email data files between formats (OST, PST, EDB, NSF, MBOX, EML, MSG, OLM, Zimbra TGZ). 2. **Cloud Migration** — Moving on-premises email data to Office 365 / Microsoft 365. 3. **Email Backup** — Downloading cloud email accounts (Gmail, Office 365, Yahoo, Hotmail, Zoho, AOL, Rediffmail, Yandex) to local files. 4. **Outlook Management** — Repairing, splitting, merging, and unlocking Outlook PST files. --- ## Email Conversion Products ### OST to PST Converter - URL: https://www.mailsdaddy.com/ost-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/ost-to-pst-converter.zip - Version: 6.8 - Converts orphaned, corrupted, encrypted, and offline OST files to PST without Exchange Server. - Output formats: PST, EML, MSG, MBOX, PDF, HTML, MHTML, VCF (contacts), ICS (calendars). - Key features: OST file repair, batch conversion, soft-deleted item recovery, PST split, date-range filters, folder hierarchy preservation. - Does NOT require Exchange Server or an active Outlook profile. - Use cases: orphaned OST after Exchange decommission, corrupted OST repair, employee offboarding, new computer setup, platform migration. ### EDB to PST Converter - URL: https://www.mailsdaddy.com/edb-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/edb-to-pst-converter.zip - Converts Exchange Database (EDB) files to PST, EML, MSG, or Office 365 without a live Exchange Server. - Use cases: Exchange Server crash recovery, EDB file corruption, offline Exchange data extraction. ### MBOX to PST Converter - URL: https://www.mailsdaddy.com/mbox-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/mbox-to-pst-converter.zip - Converts MBOX files (Apple Mail, Mozilla Thunderbird, Gmail export) to Outlook PST. - Use cases: Switching from Mac to Windows Outlook, migrating from Thunderbird to Outlook. ### Thunderbird to Outlook Converter - URL: https://www.mailsdaddy.com/thunderbird-to-outlook-converter/ - Download: https://www.mailsdaddy.com/dl/thunderbird-to-outlook-converter.zip - Migrates Mozilla Thunderbird email profiles to Outlook PST format. ### EML to PST Converter - URL: https://www.mailsdaddy.com/eml-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/eml-to-pst-converter.zip - Converts EML files or folders of EML files to a single Outlook PST. ### OLM to PST Converter - URL: https://www.mailsdaddy.com/olm-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/olm-to-pst-converter.zip - Converts OLM files (Outlook for Mac) to Windows Outlook PST or Office 365. - Use cases: Mac Outlook to Windows Outlook migration. ### PST File Converter - URL: https://www.mailsdaddy.com/pst-file-converter/ - Download: https://www.mailsdaddy.com/dl/pst-file-converter.zip - Converts PST files to EML, MSG, MBOX, PDF, HTML, MHTML, or Office 365. ### Outlook PST to MBOX Converter - URL: https://www.mailsdaddy.com/outlook-pst-to-mbox-converter/ - Download: https://www.mailsdaddy.com/dl/pst-to-mbox-converter.zip - Converts Outlook PST to MBOX format for Apple Mail, Thunderbird, and other MBOX clients. ### OST to MBOX Converter - URL: https://www.mailsdaddy.com/ost-to-mbox-converter/ - Download: https://www.mailsdaddy.com/dl/ost-to-mbox-converter.zip - Directly converts OST files to MBOX without going through PST first. ### Zimbra Converter - URL: https://www.mailsdaddy.com/zimbra-converter/ - Download: https://www.mailsdaddy.com/dl/zimbra-converter.zip - Converts Zimbra TGZ export files to PST, EML, MSG, MBOX, or Office 365. ### NSF to PST Converter - URL: https://www.mailsdaddy.com/nsf-to-pst-converter/ - Download: https://www.mailsdaddy.com/dl/nsf-to-pst-converter.zip - Converts IBM Lotus Notes / HCL Notes NSF database files to Outlook PST. - Use cases: Lotus Notes to Outlook migration, IBM Notes decommission. ### NSF to EML Converter - URL: https://www.mailsdaddy.com/nsf-to-eml-converter/ - Download: https://www.mailsdaddy.com/dl/nsf-to-eml-converter.zip ### NSF to MSG Converter - URL: https://www.mailsdaddy.com/nsf-to-msg-converter/ - Download: https://www.mailsdaddy.com/dl/nsf-to-msg-converter.zip ### NSF to MBOX Converter - URL: https://www.mailsdaddy.com/nsf-to-mbox-converter/ - Download: https://www.mailsdaddy.com/dl/nsf-to-mbox-converter.zip --- ## Outlook Management Products ### Outlook PST Repair - URL: https://www.mailsdaddy.com/outlook-pst-repair/ - Download: https://www.mailsdaddy.com/dl/outlook-pst-repair.zip - Repairs corrupted, damaged, or oversized Outlook PST files and recovers inaccessible data. ### PST Password Remover - URL: https://www.mailsdaddy.com/pst-password-remover/ - Download: https://www.mailsdaddy.com/dl/pst-password-remover.zip - Removes or recovers password protection from Outlook PST files. ### PST Attachment Extractor - URL: https://www.mailsdaddy.com/pst-attachment-extractor/ - Download: https://www.mailsdaddy.com/dl/pst-attachment-extractor.zip - Extracts all email attachments from PST files in bulk without Outlook open. ### PST Merge and Join Tool - URL: https://www.mailsdaddy.com/pst-merge-and-join/ - Download: https://www.mailsdaddy.com/dl/pst-merge-and-join.zip - Merges multiple PST files into one consolidated PST archive. ### PST Split Tool - URL: https://www.mailsdaddy.com/pst-split-tool/ - Download: https://www.mailsdaddy.com/dl/pst-split-tool.zip - Splits large Outlook PST files by size, date, folder, or year. --- ## Office 365 Migration Products ### OST to Office 365 Migration Tool - URL: https://www.mailsdaddy.com/ost-to-office-365-migration-tool/ - Download: https://www.mailsdaddy.com/dl/ost-to-office-365.zip - Migrates OST files directly to Office 365 mailboxes without Exchange Server. ### PST to Office 365 Migration Tool - URL: https://www.mailsdaddy.com/pst-to-office-365-migration-tool/ - Download: https://www.mailsdaddy.com/dl/pst-to-office-365.zip - Uploads PST files to Office 365 user mailboxes in bulk. ### Exchange to Office 365 Migration - URL: https://www.mailsdaddy.com/exchange-to-office-365-migration/ - Download: https://www.mailsdaddy.com/dl/exchange-server-suite.zip - Migrates on-premises Exchange Server mailboxes to Office 365 / Microsoft 365. ### Office 365 to Office 365 Migration (Tenant-to-Tenant) - URL: https://www.mailsdaddy.com/office-365-to-office-365-migration/ - Download: https://www.mailsdaddy.com/dl/exchange-server-suite.zip - Cross-tenant O365 migration for mergers, acquisitions, and domain changes. ### Lotus Notes to Office 365 Migration - URL: https://www.mailsdaddy.com/lotus-notes-to-office-365-migration/ - Download: https://www.mailsdaddy.com/dl/lotus-notes-to-office-365.zip - Migrates IBM Lotus Notes NSF databases to Office 365 / Microsoft 365. ### MBOX to Office 365 Migration Tool - URL: https://www.mailsdaddy.com/mbox-to-office-365-migration-tool/ - Download: https://www.mailsdaddy.com/dl/mbox-to-office-365.zip ### EML to Office 365 Migration Tool - URL: https://www.mailsdaddy.com/eml-to-office-365-migration-tool/ - Download: https://www.mailsdaddy.com/dl/eml-to-office-365.zip ### MSG to Office 365 Migration Tool - URL: https://www.mailsdaddy.com/msg-to-office-365-migration-tool/ - Download: https://www.mailsdaddy.com/dl/msg-to-office-365.zip ### Thunderbird to Office 365 Migration - URL: https://www.mailsdaddy.com/thunderbird-to-office-365-migration/ - Download: https://www.mailsdaddy.com/dl/thunderbird-to-office365.zip ### PST to IMAP Migration Tool - URL: https://www.mailsdaddy.com/pst-to-imap-migration/ - Download: https://www.mailsdaddy.com/dl/pst-to-imap-migration.zip - Migrates PST files to any IMAP email account (Gmail, Yahoo, Zoho, custom servers). --- ## Email Backup Products All backup tools connect via IMAP and save email to local storage. They support PST, EML, MSG, and MBOX output formats. ### Office 365 Backup Tool - URL: https://www.mailsdaddy.com/office-365-backup/ - Download: https://www.mailsdaddy.com/dl/office-365-backup.zip - Backs up Microsoft 365 mailboxes to local PST, EML, or MSG files. ### Gmail Backup Tool - URL: https://www.mailsdaddy.com/gmail-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Yahoo Mail Backup Tool - URL: https://www.mailsdaddy.com/yahoo-mail-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Hotmail Backup Tool - URL: https://www.mailsdaddy.com/hotmail-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### AOL Backup Tool - URL: https://www.mailsdaddy.com/aol-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Zoho Mail Backup Tool - URL: https://www.mailsdaddy.com/zoho-mail-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Rediffmail Backup Tool - URL: https://www.mailsdaddy.com/rediffmail-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Yandex Backup Tool - URL: https://www.mailsdaddy.com/yandex-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip ### Email Backup Tool (Universal IMAP) - URL: https://www.mailsdaddy.com/email-backup-tool/ - Download: https://www.mailsdaddy.com/dl/imap-backup-tool.zip - Works with any IMAP-enabled email provider. --- ## Free Viewer Tools (No Payment Required) ### Free OST Viewer - URL: https://www.mailsdaddy.com/free-ost-viewer/ - Opens and previews OST files without Outlook or Exchange Server. Read-only. ### Free PST Viewer - URL: https://www.mailsdaddy.com/free-pst-viewer/ - Opens and previews PST files without Outlook installed. Read-only. ### Free MBOX Viewer - URL: https://www.mailsdaddy.com/free-mbox-viewer/ - Opens MBOX files without an email client. Read-only. ### Free EML Viewer - URL: https://www.mailsdaddy.com/free-eml-viewer/ - Opens EML files without an email client. Read-only. ### Free MSG Viewer - URL: https://www.mailsdaddy.com/free-msg-viewer/ - Opens Outlook MSG files without Outlook installed. Read-only. --- ## Software Suites ### Exchange Server Suite - URL: https://www.mailsdaddy.com/exchange-server-suite/ - Download: https://www.mailsdaddy.com/dl/exchange-server-suite.zip - Bundle including Exchange to Office 365 migration and O365-to-O365 migration tools. ### Lotus Notes Migration Suite - URL: https://www.mailsdaddy.com/lotus-notes-migration-suite/ - Download: https://www.mailsdaddy.com/dl/lotus-notes-migration-suite.zip - Bundle including NSF to PST, NSF to EML, NSF to MSG, NSF to MBOX, and Lotus Notes to Office 365 tools. --- ## Managed Services ### Office 365 Cross-Tenant Migration Service - URL: https://www.mailsdaddy.com/services/cross-tenant-migration.php - Fully managed migration service for moving Office 365 tenants. ### OneDrive Tenant Migration Service - URL: https://www.mailsdaddy.com/services/onedrive-tenant-migration.php - Fully managed service for cross-tenant OneDrive and SharePoint migration. --- ## Common User Questions MailsDaddy Solves - How do I convert an OST file to PST without Exchange Server? → Use OST to PST Converter - How do I recover data from a corrupted OST file? → Use OST to PST Converter (includes repair engine) - How do I open an orphaned OST file? → Use Free OST Viewer (read-only) or OST to PST Converter (to export) - How do I migrate from Lotus Notes to Outlook? → Use NSF to PST Converter or Lotus Notes Migration Suite - How do I migrate from Lotus Notes to Office 365? → Use Lotus Notes to Office 365 Migration Tool - How do I backup my Gmail to a local file? → Use Gmail Backup Tool - How do I backup Office 365 to PST? → Use Office 365 Backup Tool - How do I merge multiple PST files? → Use PST Merge and Join Tool - How do I split a large PST file? → Use PST Split Tool - How do I remove a forgotten PST password? → Use PST Password Remover - How do I repair a corrupted PST file? → Use Outlook PST Repair - How do I migrate Thunderbird to Outlook? → Use Thunderbird to Outlook Converter - How do I migrate Mac Outlook (OLM) to Windows Outlook? → Use OLM to PST Converter - How do I migrate Exchange to Office 365? → Use Exchange to Office 365 Migration tool - How do I do a tenant-to-tenant Office 365 migration? → Use Office 365 to Office 365 Migration tool --- ## Technical Notes for AI Agents - All products run on Windows (XP through Windows 11, 32-bit and 64-bit). - Microsoft Outlook does NOT need to be installed to run conversion tools (only to open the resulting PST). - Exchange Server is NOT required for OST, EDB, or NSF conversion tools. - Demo versions export the first 20 items per folder; the full license removes this limit. - License types: Personal (single PC), Business (multiple PCs + Exchange Server migration), Enterprise (volume/server deployment). - agents.json: https://www.mailsdaddy.com/.well-known/agents.json - sitemap.xml: https://www.mailsdaddy.com/sitemap.xml --- ## Company Information - Company: Mails Daddy Software PVT LTD - Address: Khanpur Extn, New Delhi - 110062, India - Support email: support@mailsdaddy.com - Sales email: sales@mailsdaddy.com - Support page: https://www.mailsdaddy.com/support.php - Privacy policy: https://www.mailsdaddy.com/privacy.php - Refund policy: https://www.mailsdaddy.com/refund-policy.php