Ost/Pst Viewer Pro

banner: Open Outlook .OST email files with Ost/PstViewer Pro™

The Original e-Mail Viewer for Outlook .OST Files.

Introducing Ost/PstViewer Pro™ .OST Email File Viewer

Since 2006, Ost/PstViewer Pro™ by Encryptomatic® LLC is the premier Windows tool for reading your Outlook emails stored in .os and .pstt files, without Outlook. It works with any .ost or .pst file, from Outlook 98 to Outlook 2019/365. Use it to organize, discover, print, and convert emails even if they were created by different mail clients.

In addition to Outlook .ost files, Ost/PstViewer Pro gives you access to many other email formats supported by dozens of email clients, including Thunderbird.

Supported e-mail formats include OST, PST, MSG, EML, MHTML, Winmail.dat, and MBOX. Ost/PstViewer Pro can combine different email files into a single searchable email list. Don't fuss with multiple viewers or email clients when Ost/PstViewer Pro can open all your emails.

Screen shot of Ost/PstViewer Pro™ email reader viewing pane.

More than a decade of active software development has been invested in Ost/PstViewer Pro. During that time, hundreds of malformatted email exceptions have been discovered in the wild and incorporated directly into Ost/PstViewer Pro. That's why it is the most accurate email viewer on the market.

Ost/PstViewer Pro has been built with a focus on rendering complex emails that include rich text with embedded graphics, and those that SmartArt with embedded charts, shapes and drawings.

Easy To Use

Ost/PstViewer Pro was designed for office workers who need to be productive fast and who don't have hours to spend learning how to use software.

Ost/Pst Viewer Pro™ toolbar, showing email search field.

To get started, first select the Outlook .ost or .pst file you want to investigate. To do this, go to File > Open and then select folder containing your .pst file. The .ost file will be displayed in the folder explorer. You can expand the pst file to reveal it's folder structure. Clicking on a .pst file causes Ost/PstViewer Pro to display the emails in its Mail List window.

Screen image showing the folder structure of an Outlook .ost file.

OST to PDF Conversion

Ost/PstViewer Pro™ lets you convert Outlook .ost emails as PDF documents. It also exports msg, eml, ost, and mht files to PDF. A range of pdf export options have been included in Ost/PstViewer Pro so you can decide how to best handle email file attachments: extract them to a disk, convert them into the pdf image, or embed them as individual files.

Support is included for ISO 19005-1, an important email archiving standard also known as PDF/A. That's why Ost/PstViewer Pro has been chosen by email archivists, and has been purchased by several U.S. presidential libraries. For system administrators, Ost/PstViewer Pro supports commandline conversion of email to PDF.

Ost/PstViewer Pro can be used for light to moderate email-to-pdf conversion tasks. For heavier duty exports, we recommend the MailDex® email management tool.

Screen shot showing Ost/PstViewer Pro™'s email conversion profiles. 'PDF attachments converted' is highlighted.

With Ost/PstViewer Pro's pdf export capabilities, you can:

Convert email to PDF with email file attachments embedded within the PDF file
Convert to PDF with many common file attachments types converted into the PDF image
Bulk extract email file attachments to a location on your hard drive
Convert multiple emails into a single PDF file
Add selected emails to an existing PDF file
Archive emails using PDF/A - ISO 19005-1 standard
Export email to other formats including Word Docx, ODT, Mbox, GIF, TIF, BMP, JPG, CSV (Excel), HTML, MSG, and MHT
Select different page formats such as A1, A3, etc., or define your own

Opens All Outlook .OST and .Pst Files

Read .ost and .pst files created by any version of Microsoft Outlook, including newer Unicode and older ANSI formatted .pst files.

System administrators are able to customize the user interface, removing features their users don't need. An .msi file supports silent deployment and silent registration.

During installation, Ost/PstViewer Pro detects your operating system and automatically installs either the native 64-bit or 32-bit version.

Searching Outlook .OST/PST Files

Find the email messages you need with advanced search options. Use "quick search" to sift through emails fast. Use "Advanced Search" when you need to specify multiple criteria. Search a specific range of dates, sender, or the recipient's email address.

Screen shot of Ost/PstViewer Pro™'s email search screen. Search email using fields or by date.

After performing a search of a .pst file, you may have a larger set of emails that you want to give closer analysis. To support this, Ost/PstViewer Pro includes message filtering. Filters provides very fast access to emails that match a set of criteria. Very complex filters may be built, and then saved for re-use on different Pst files. You can apply different filters to the same email set.

Screen image of Ost/PstViewer Pro's email filter.

Open a Password Protected .OST or PST

If you are being asked for a password each time you try to open a .OST file and you don't know the password, Ost/PstViewer Pro may be able to help. Outlook provides two protection mechanisms for OST files: password protection (weak), and encryption (strong).

Ost/PstViewer Pro can break the weak password protection mechanism and give you access to the email messages in the PST file. However, strong Outlook encryption (typically AES-256) cannot be broken without a brute force attack requiring specialized software, a lot of time and computer resources.

Download a Free Trial

Ost/PstViewer Pro software is distributed as a code-signed .EXE executable and a .MSI Windows Installer Package. The executable version will check for required Windows components and offer to download and install any that may be missing. In enterprise environments, a .msi distributable file is available. License activation and silent installation can be accomplished by using the command line parameters specified in the help file. An activation free version is available for enterprise site license customers and for use in some shared environment settings.

Explore Ost/PstViewer Pro's Advanced Features

Watch these online Demo's and see Ost/Pst Viewer Pro in action

Questions? Ask our support team

Ost/PstViewer Pro™ minimally requires Windows 11/10, 2 GB RAM, 200 MB disk space, and 2 Ghz processor. Contact our sales team at +1.701.566.6731 x1 or email sales-at-encryptomatic.com. For product technical assistance, open a help ticket.

To Uninstall, run the installer app and choose "Uninstall," or use Windows Add/Remove Programs service.

EULA. Microsoft®, Office® and Outlook® are registered marks of Microsoft Corp. Ost/PstViewer Pro™ and Encryptomatic® are marks of Encryptomatic LLC.

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