PST Upgrade & Downgrade

PST Upgrade & Downgrade is the most comprehensive Windows utility program for upgrading and downgrading Outlook email clients from the oldest to the latest versions and vice-versa. The primary function of this software is to convert ANSI PST files into Unicode format and Unicode PST files into ANSI format. Moreover, it can safely convert PST files without causing any alteration to the original files and keep them intact or unchanged after a successful conversion.

  • Upgrading Outlook client by converting ANSI PST files into the Unicode format.
  • It allows users to downgrade Outlook clients by converting Unicode PST files into ANSI format.
  • Support batch conversion of PST files (both ANSI and Unicode) at a time.
  • Auto-generate LOG file containing all the information of PST upgrade and downgrade operation.

(Average Rating 4.9 Based on 1025 rating)

*SysInfo PST Upgrade & Downgrade Tool is Fully Secured Download Version.

Steps to Upgrade and Downgrade PST Files

Prominent Features of PST Upgrade & Downgrade Software

Upgrade ANSI PST to Unicode PST

Upgrade ANSI PST to Unicode PST

The Software has been smartly designed to upgrade Outlook clients to the latest Outlook version from any old version. It can easily convert Outlook files saved in ANSI PST format into Unicode PST format. By upgrading Outlook, you can increase the mailbox size limitation of PST files from 2 GB to 20 GB.

Convert Unicode PST to ANSI PST

Convert Unicode PST to ANSI PST

Another function of this software is to downgrade Outlook clients from the latest version to an older one. Older versions support the ANSI format, while New versions support the Unicode format. Switching back to an older version, i.e. 2002 or earlier, needs an Outlook downgrade, and this tool will help you do that.

Offers Batch Conversion of PST

Offers Batch Conversion of PST"

Converting multiple PST files at the same time is no more challenging. This SysInfo PST Upgrade & Downgrade Tool has an advanced feature that allows users to perform batch conversion of selected multiple PST files simultaneously in just a single click. Just make sure all the selected PST files are of identical format, i.e. ANSI or Unicode.

Auto-Search Outlook Data Files

Auto-Search Outlook Data Files

Don’t worry if you no longer know where your PST files are stored on your computer. The auto-search feature of this ANSI to Unicode Tool allows you to search your PST files on your system in an auto-mode. You need to define the most probable location where you think the files are stored, and this tool will search them for you within a single mouse click. Read:- How to Fix Outlook Search Problem.

Add PST to Outlook

Add PST to Outlook

Users can add new PST files to their Outlook profile directly from the software; no need to add them manually. Before starting the actual PST conversion process, you need to check to Add a new PST file(s) in the Outlook profile box. You can also use our Add Outlook PST Software for multiple PST files addition.

Exclude Deleted Items

Exclude Deleted Items

If you want to exclude the deleted items from the output PST files, check the "exclude deleted items" box in the software wizard before starting the PST conversion process, either Unicode to ANSI or ANSI to Unicode. This feature will not save the deleted items of your old PST files into a new file(s).

Remove Duplicate Items

Remove Duplicate Items

Users can remove duplicate items from their outlook PST files to make them handy and compact using this software. Before the software can perform the actual PST upgrading or downgrading process, you can check the Remove Duplicates in the Outlook PST file(s) box. Further, to remove the duplicate items from the PST items based on different categories, you can also use the Outlook Duplicate Remover Tool.

Merge Contacts Option

Safe-to-Use Application

This SysInfo Upgrade & Download PST Tool is efficient enough to execute the entire PST conversion process, i.e. ANSI to Unicode and Unicode to ANSI, in a safe mode. No changes or alteration is made on the original PST files. It maintains the Meta-data information throughout the operation of upgrade or downgrade.

Easy-to-Use & Interactive GUI

Easy-to-Use & Interactive GUI

The interactive user interface makes this software convenient and easy for non-technical and complete novice users meaning that no prior technical knowledge is needed to use this software. In Addition, this software's "auto-log generation" feature generates a log file at the location shown before the conversion process gets completed.

Supportability of Outlook Version

Supportability of Outlook Version

The Software supports PST files saved in both ANSI and Unicode formats and created by any older and latest version of Outlook like ANSI PST files of Outlook 97, 98, 2000 and 2002, and Unicode PST files of Outlook 2003, 2007, 2010, 2013, 2016 and the latest 2019. Read:- How to Determine MS Outlook Version?

Software Specifications

Sysinfo PST Upgrade & Downgrade Tool specifications, users can follow before use of this software for ease of working.

About Product Version
Multiple User
Home, Administrator, Technician, and Enterprise
Release Date
23 March 2022
Requirements & Supported Versions Pentium class processor Minimum
512MB RAM (1GB Recommended)
Disk Space:
Enough Space to Store Recovered Output.
Support Windows:
11/ 10/ 8.1/ 8/ 7/ 2008/ 2012(32 & 64-bit), etc.
Requirements & Supported Versions Support Outlook:
Office 365, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97.
Additional Information

Demo & Full Version Comparison

Get an overview of the PST Upgrade & Downgrade Software Features- Demo and Licensed Version.

Product Features Free Version Full Version
Offers Multiple Options like Add files, Search, Remove, Remove all.
Display PST file information like size, type, and name
Convert ANSI to Unicode
Convert Unicode to ANSI PST
Option to exclude deleted and duplicate items
Attach new PST files in Outlook profile
Upgrade & Downgrade PST files 25 Items(Each PST file) All
24*7 Tech Support & 100% Secure
Price Free $49
Money-Back Guarantee
Frequently Asked Questions

Listed Commonly Asked Question and their Solutions

You need to follow the steps below to convert the Outlook PST files from ANSI to Unicode:

  • Start the SysInfo PST Upgrade & Downgrade Tool.
  • Click on the Add PST Files button to browse PST.
  • Just preview the browsed one and click Next.
  • Now, the select path for the resultant folder.
  • Enable the radio button of Convert ANSI to Unicode.
  • You can also add your PST file into Outlook directly.
  • Here, one can also remove deleted & duplicate items.
  • Click the Convert PST File button to start the process.

The only need is to perform the steps below:

  • Firstly, start the SysInfo PST Upgrade Tool.
  • Browse the old PST file from your system.
  • After adding the required one, click Next.
  • Select the saving path for the output folder.
  • Opt for the Convert ANSI to Unicode option.
  • Finally, click the Convert PST File button.
  • A log report is also generated on your PC.

Follow these steps to make a backup copy of your PST file:

  • Close MS Outlook before backing off your .pst file.
  • Open the Control Panel in your system.
  • Double-click the Mail icon
  • Click "Show Profiles"
  • Click your configured profile, and then click Properties.
  • Click Data Files
  • Under "Name," click the Personal Folders Service that you want to back up. By default, this service is called Personal Folders.
  • Click "Settings," and then note the path and file name.
  • Close all the Properties windows
  • Now you can use the PST file which you noted in step8.

Follow these steps to export your PST file data:

Open MS Outlook.

  • Go to the File menu click Import and Export.
  • Click Export To File, and then click Next.
  • Click Personal Folder File and then click Next.
  • Click the folder that you want to export, and then click Next.
  • Click Browse and select the location where you want the save new .pst file.
  • In the File Name box, type the name you want to use for the new .pst file, and click OK.
  • Click Finish.

The software relies on "redemption.dll," the core dll for functionality. It is a COM Dll, so it must be registered or present on the same folder "software.exe" reside. Please make sure that dll is present on the above said location and try to install it using regsvr32.exe, a standard windows executable to register COM Dlls.

c:\> regsvr32.exe "[path of program folder]\redemption.dll" There is a chance that you have installed various other email migration tools from different vendors on your system, and they also use the same core DLL but different versions. COM Dlls are system-wide available, so their installation can also cause this behavior of the software. If possible, then try to uninstall them from your system. If the problem persists, please email us again at and mention your OS and the MS Outlook versions. It will significantly help us to identify the problem. If you have another system at your disposal, you can install our demo version on that system and check for this behavior. If things work on that system, then without uninstalling the demo version, install the full version and send us a new .info file at, and we will issue a new software activation key.

Yes, you can use this software in the case of a password-protected Outlook File. It's also possible to upgrade a password-protected PST file with the help of this software. Check out the blog How to Encrypt PST Files in Outlook 2010 and 2007?

This software works in two ways as PST Upgrade Software deals in upgrading and downgrading file types.

You need to have PST files recovered to use this PST upgrade and Downgrade software. To recover PST files, you can use another highly-recommendable PST File Repair Tool.

TIt would be best to have MS Outlook (2000/2003/2007/2010) installed on your system before running the software.

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