Stellar Converter for OST
Stellar Converter for OST converts inaccessible, orphaned, encrypted, or IMAP OST files into PST format for Microsoft Outlook.
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SysTools IMAP Backup Tool
by SYSTOOLS SOFTWARE PRIVATE LIMITEDMicrosoft 365Paid
Backs up email from IMAP accounts and exports mailbox data to formats including PST, MBOX, EML, MSG, and PDF.
PRICINGPaid
DEPLOYMENTCloud
CATEGORYUtilities
UPDATED ON MARKETPLACE
What it does
Downloads email from IMAP-enabled accounts, including Gmail, Yahoo Mail, Outlook.com, and other IMAP-supported servers. It exports mailbox data in multiple formats, with available formats differing between Windows and macOS. Date-range and folder filters select the email to export, while subsequent backups download newly received messages. The tool preserves folder hierarchy, metadata, attachments, formatting, and other email attributes during backup.
Key capabilities
from the Microsoft Marketplace listingOAuth 2.0 authentication
Connects to services such as Gmail and Office 365 using OAuth 2.0 authentication without storing passwords.
Multiple account backup
Backs up multiple IMAP-enabled email accounts from one interface.
Date and folder filters
Filters exports by date range or selected mailbox folders.
Folder hierarchy preservation
Retains folders, subfolders, metadata, attachments, formatting, and email attributes during export.
Incremental backups
After the first full backup, downloads only newly received emails in later backups.
Multiple export formats
Exports mailbox data to formats including PST, MBOX, EML, MSG, PDF, EMLX, CSV, HTML, and MHT.
Credential-based access
Requires valid account credentials and does not store login credentials within the application.
Windows and macOS support
Runs on Windows and macOS.
Who it's for
The vendor names MSPs and IT professionals as users of the tool.
How it compares
SysTools IMAP Backup Tool, Stellar Converter for OST, and Stellar Repair for Outlook are all listed as paid products with cloud deployment. SysTools was updated in Mar 2026, while both Stellar alternatives were updated in Jan 2026.
| Name | Pricing | Deployment | Updated |
|---|---|---|---|
| this plugin | Paid | Cloud | |
| Stellar Converter for OST | Paid | Cloud | |
| Stellar Repair for Outlook | Paid | Cloud |
In the catalog
23 plugins in Outlook · Utilities
Price distribution: 8 paid, 15 price not published
Pricing & deployment
Platform
Microsoft 365
Product
Outlook
Deployment
Cloud
Pricing
Paid
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What the vendor says
«Securely download and preserve your emails from any IMAP-enabled account with the SysTools IMAP Backup Software. This powerful solution allows you to back up mailbox data from popular email services such as Gmail, Yahoo Mail, Outlook.com, and other IMAP-supported servers without data loss. This IMAP downloader enables …»
Official marketplace listing
Marketplace
Publisher
SYSTOOLS SOFTWARE PRIVATE LIMITED
Updated on marketplace
Facts verified