Microsoft Outlook
ReliefJet ESSENTIALS™
for Microsoft Outlook
ReliefJet Essentials for Outlook is a comprehensive set of more than 160 tools for performing a wide range of tasks in processing email messages, contacts, appointments, meetings, tasks and other Outlook items as well as Office 365 or Exchange Server folders and mailboxes.
ReliefJet Essentials™
for Microsoft Outlook
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Convert PST to HTML

This utility converts email messages from PST data files used by Microsoft Outlook only to HTML format. You can view saved HTML files on any computer or mobile phone by opening them in a web browser. You can publish these messages online or share it with partners who have no Outlook installed. You can use PST to HTML conversion as an additional email backup.

Converting email from PST to HTML files is a convenient way to save it to a universal format for viewing on any device.

What is an Outlook PST data file?

Microsoft Outlook uses the PST file format to store its data such as messages, contacts, appointments and meetings, tasks, notes, documents, journal entries, etc. All data can be located in folders of distinct types: mail, calendars, and others. Besides, PST files store important additional properties of Outlook items and folders. For example, rules and alerts, view settings, or search folders.

Therefore, when transferring data from PST to another location, it is necessary to properly process the information stored in them. By simply copying PST files, you can cause Outlook to malfunction.

What are HTML files?

HTML file contains the HyperText Markup Language, which is used to format the structure of a web page. It is mainly used by web browsers to display web pages. An HTML file is a plain text document containing special tags defining the layout of a web page like text, tables, hyperlinks, formatting, and many other elements.

You can view the HTML page by opening it in any web browser: Google Chrome, Mozilla Firefox, Microsoft Edge, Opera on any device, or Apple Safari if you use MacOS or iOS.

Why convert PST to HTML?

There are several reasons for PST2HTML email conversion:

  1. Compatibility. PST is the internal Microsoft Outlook format. To access your emails and attachment files in the PST file, you need to have Outlook installed. To access messages when no Outlook is installed, you need to convert them to another format. HTML is a convenient format for viewing, printing, searching and publishing, it retains the original formatting and images.
  2. Cross-platform. The Microsoft Office Outlook version that works with PST data files is available for Windows only. HTML viewers are available on all platforms, including smartphones and legacy devices. To share a message with another user, save it to an HTML file and the recipient is guaranteed to open and view it, regardless of what device or operating system they use.
  3. A separate file for each email. The PST data file stores all your email messages, so if it gets damaged, all your email will be lost at once. When converting from PST to HTML, messages are saved in separate files. If you lose one of them, the rest will remain untouched.
  4. Images and formatting. Images in messages are often links to external Internet resources. If the resource becomes unavailable, the images disappear from your emails. When converting from PST to HTML, all external images are downloaded to your disk. You can be sure the messages are saved in their original form.

Why can't you perform PST to HTML conversion online?

PST files contain your important and confidential data. When you use an online service to convert email from PST to HTML, all your sensitive data is transferred to someone else's server, including private messages, contacts, tasks, and notes. The data is processed on an unknown computer, and you can't control it in any way. Only then can you download the resulting HTML documents.

In contrast to online converters, our utility works strictly on your computer. Information from the PST data file is not uploaded anywhere. Your data will not fall into the wrong hands.

How is saving PST to HTML better than other formats?

  • You can open HTML files on any device or platform without installing additional software.
  • HTML documents are well suited for easy sharing with other users.
  • HTML keeps formatted text, message subject, date, recipients and sender, and links to attachments.
  • The attachment files are in a separate folder, and you can easily open or copy them if necessary.
  • Each message is saved to a separate HTML file and not the entire folder as in MBOX case.
"Convert PST to HTML" Screenshots
Convert PST to HTML

How to convert PST to HTML?

To extract emails from PST data files into HTML format:

  1. Select the source folder with PST files and choose the destination folder.
  2. Specify whether to create separate folders for each PST file or create the original Outlook folder structure.
  3. If necessary, configure additional filters, such as the date range, sent or received message status, and others.
  4. Run the utility and everything else will be done automatically.

Our utility works with PST files without having to connect them to your Outlook profile manually. After starting the utility, the work will be done automatically, regardless of how many PST files you need to convert.

Are there any limits when converting from PST to HTML?

There are no restrictions on the number and size of converted PST and received HTML documents. You can convert an unlimited number of folders or files as often as you want.

The utility saves from PST to HTML emails only. All other Outlook items, such as appointments, meetings, and contacts, will be skipped.

How to customize file names when saving HTML from PST?

You can select a folder for HTML files on your disk or network share or specify a template for flexible naming of folders and HTML files.

The utility allows you to flexibly configure the names of resulting folders and HTML files. To do this, you can use macros in the target path. For example, the message subject, the names and domains of the sender or recipients, dates, Windows environment variables, and many other values.

Advanced users may want to use regular expressions to extract strictly the necessary parts of the subject, body, and other message fields in the target folder and file names.

How to perform mass PST to HTML email conversion?

The program can bulk convert PST to HTML in batch scripts, using PowerShell, Task Scheduler, and other automation tools. To do this, use the command-line utility in the product. If you run several command-line apps at once, the automatic conversion of several PST files to HTML will become much faster due to parallel execution.

To schedule PST to HTML conversion, use the command-line application provided by the product along with the standard Windows Task Scheduler. This allows you to flexibly configure schedule parameters and use the utility in your scenarios even without logging into a user account.

By converting emails from Outlook PST data files to HTML format, you will get separate files for each message in folders on your disk or network share, according to the original Outlook folder structure. Later, you can view and print HTML messages on any device and operating system with no need to install Outlook.


Described features are part of ReliefJet Essentials for Microsoft Outlook: fast and reliable productivity solution for Microsoft Outlook. Besides them ReliefJet Essentials provides many other useful features that significantly simplify every Outlook user's life. An Outlook add-in and a command line utility are also provided along with the standalone application.

Related Utilities: Export Messages to HTML, Convert PST to PDF, Convert PST to EML.

Purchase ReliefJet Essentials for Outlook

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      Best Value!    
    Single Utility License Personal Edition Professional Edition  
Number of utilities available 1 All 166 included All 166 included
Key Features
Integration with Outlook rules No Yes Yes
Macros for utility parameters No Yes Yes
Command line support No No Yes
Integration with Task Scheduler No No Yes
Support for Windows Server OS No No Yes
Support and Updates
Product support 1 Year 2 Years Lifetime
Free updates No 1 Year 2 Years
Free remote assistance No Yes Yes
Free script writing assistance No No Yes
Price Per License
1 license purchase $19.95
($19.95 per utility)
$49.95
($0.30 per utility)
$199.95
($1.20 per utility)
2-9 licenses purchase $14.95 $34.95 $129.95
10+ licenses purchase $9.95 $19.95 $99.95
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Compatible with Windows 10