PST Upgrade & Downgrade v8.01

Convert ANSI PST Files into Unicode PST Files & Unicode PST Files into ANSI PST Files

User Ratings :   (Average Rating 4.7 Based on 65 Reviews)


PST Upgrade & Downgrade

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PST Upgrade & Downgrade is the most comprehensive Windows utility programmed for upgrading and downgrading Outlook email client 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. Being a non-destructive utility, it can safely convert PST files without causing any alteration to the original files and keep them intact or unchanged after successful conversion. If we talk about its user-interface, it's highly interactive and self-destructive. If you're a complete novice user with no prior technical expertise, you can still use this software with ease.

  • Upgrading Outlook client by converting ANSI PST files into Unicode format.
  • Also downgrade Outlook client 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
  • Non-destructive in nature, hence keeps the original PST files intact or unchanged
  • Preserving Meta-data information of selected PST files after the successful conversion
  • Auto-search option to search the PST files in your system directory in just few seconds
  • Users can attach new PST files directly to their Outlook profile
  • Exclude deleted items and remove duplicate items features are enabled
  • Easy-to-use application, (i.e. requires no prior technical expertise to use this software)
  • Support all higher and lower versions of Microsoft Outlook email client including latest 2016
  • Smooth compatibility with all popular Windows-based operating systems including Win 10

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Version: v8.01
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Price: $59
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Demo Limitations - Trial version is safe to download and convert first five emails for free

Prominent Features of PST Upgrade & Downgrade Software

PST Upgrade & Downgrade
Upgrade ANSI PST to Unicode PST

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

upgrading outlook
Convert Unicode PST to ANSI PST

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

convert Outlook files
Batch Conversion

Converting multiple PST files at the same time is no more challenging. The batch conversion feature allows users to select multiple PST files at a time and perform conversion in just a single click. Just make sure all the selected PST files are of same format, i.e. ANSI or Unicode. Conversion of 3 ANSI and 2 Unicode PST files at a time can’t be done. Checkout this blog to convert ANSI PST to Unicode manually.

ANSI to Unicode
Auto-Search PST

Don’t worry if you have no longer idea where your PST files are stored on your computer system. The auto-search feature of this software allows you to search your PST files on your system in an auto-mode. You just 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.

Unicode to ANSI
Log Generation

The "auto-log generation" feature of this software generates a log file at the location which will be shown before the conversion process will be completed. The log file which is saved in text format, contains all the information of PST upgrade or downgrade process.

PST upgrade
Add PST to Outlook

Users can add new PST files to their Outlook profile directly from the software, no need to add them manually. Just before you can start the actual PST conversion process, you need to check Add new PST file(s) in Outlook profile box. You can use our Add Outlook PST Software as well.

downgrade PST
Exclude Deleted Items

If you want to exclude the deleted items from the output PST files, you can check the "exclude deleted items" box before starting the PST conversion process. This feature will not save the deleted items of your old PST files into new file(s).

PST upgrade & downgrade
Remove Duplicate Items

Additionally, users can remove the duplicate items from their outlook PST files to make them handy and compact in size. Before the software can perform actual PST conversion, you can check Remove Duplicates in Outlook PST file(s) box.

Outlook upgrade
Safe-to-Use Application

It’s a non-destructive tool that executes 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.

upgrade Microsoft Outlook
Easy-to-Use Application

The interactive user-interface makes this software convenient and easy for non-technical as well as complete novice users meaning that no prior technical knowledge is needed to use this software. Online video tutorials and snapshots would be helpful in this regard.

Outlook downgrade
High Supportability

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

PST Upgrade
Windows Compatibility

Being a Windows utility, this software is smoothly compatible with all popular Windows-based operating systems, such as: Windows 10, 8.1, 8, 7, Vista, XP, 2000, 98, NT, 95 and Windows Server 2012, 2008 R2, 2008, 2003 R2 and 2003.

Important Note:
  • This software doesn't support corrupt PST files; so, if your PST files are corrupt, you need to repair them first with the help of PST Repair software.
  • Additionally, if your PST files are password-protected, unlock the PST files with the help PST Password Recovery software.

PST Upgrade & Downgrade Has Become an Essential Task for Outlook Users. Why?

PST upgrade and downgrade are two different operations which are performed individually.

PST Upgrade

Upgrading PST means converting PST from ANSI to Unicode format. If you're upgrading Outlook from older to newer version, you must convert ANSI PST to Unicode. ANSI PST file is supported by Outlook 97 to Outlook 2002. PST file saved in ANSI format has 2 GB size limitation. To avoid this size limit and get more free space to store large mailbox, Outlook users upgrade their Outlook client. Though you can get maximum size of 20 to 50 GB by upgrading Outlook, but this doesn't provide you more space in your old PST files. You must upgrade PST files from ANSI to Unicode format to increase the size limitation.

PST Downgrade

Downgrading PST means converting PST files from Unicode to ANSI format. If you're downgrading Outlook from newer to older version, you must convert Unicode to ANSI PST. Unicode PST files are supported by Outlook 2003 and later versions. PST files saved in Unicode format have a size limitation of 20 to 50 GB which is fairly large. But sometimes, users need to downgrade their Outlook client due to any reason. You can't open a Unicode PST file in any older version of Outlook. To open a Unicode PST file in Outlook 2002 or any earlier version, you must convert it to ANSI format.

Comparison of Trial & Full Version

Product Features Free Version Full Version
Convert Ansi PST to Unicode PST and Unicode PST to Ansi PST files
Maintain all email meta information
Attach new PST files in outlook profile
Support password protected PST files
Save Upgrade & Downgrade files 5 Items(Each PST file) ALL
24*7 Tech Support & secure 100%
Price FREE $59
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Specifications of PST Upgrade and Downgrade Tool

PST Upgrade Tool

Norton Seal windows 10 compatible

Trial Limitations

Demo version comes with a restriction to convert only first five emails of each folder. To leverage on its complete Full functionality you can go for the fully licensed version of this software for best results.

Basic Requirements
  • Pentium class processor
  • Minimum 512MB RAM (1GB recommended)
  • 50 MB Software installation
  • Disk Space - Enough space to store recovered output

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Frequently Asked Questions

How do I make a backup copy of a PST file?

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

  • Close MS Outlook before making backing of your .pst file.
  • Open 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 that appears
  • Close all the Properties windows
  • Now you can use the PST file which you noted at step8
How do I export PST file data?

Follow these steps to export your PST file data:

  • Open MS Outlook
  • Go 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 then select the location where you want the save new .pst file
  • In the File Name box, type the name that you want to use for the new .pst file, and then click OK
  • Click Finish
Software prompt error message: "Please reinstall the application, some dll's are missing to install." What am I missing to run the software?

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

Standard command to register COM dll on your system is:

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 to this behavior of the software. If possible then try to un-install them from your system. If the problem persists, please email us again at and mention your OS version and MS Outlook version you are using. This will greatly help us to identify the problem. If you have another system on your disposal then you can install our demo version on that system and check for this behavior, if things work on that system then without uninstalling demo version install the full version and send us new .info file at and we will issue a new software activation key.

Does this software support up-gradation of password protected ANSI PST Outlook File?

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

I want to compress the size of PST file. Can this software work for downgrading a Unicode PST to ANSI file format?

This software works in two ways as PST Upgrade Software deals in both the upgrading and downgrading of File types.

Does this software also work with corrupted or damaged PST files?

You need to have PST files recovered to use this PST upgrade and Downgrade software. To recover PST file, you can use another tool PST File repair

Do I need to have MS Outlook installed on my system for this software functioning?

To use this software, you need to have MS Outlook (2000/2003/2007/2010) installed on your system before running the software.

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Client Reviews


Considering that the PST files I had recently received officially were of the older PST version and I did not want to face any compatibility conflict, my problem was resolved with PST Upgrade which very easily converted the file from ANSI PST to Unicode PST formatting. Thank you, SysInfoTools!

- Nathaniel Patrick

As a technical person, I have seen many applications online serving PST upgrade with reliability claims but none that could safely covert Unicode PST to ANSI PST. PST upgrade and downgrade from SysInfoTools did the job very efficiently and I am completely grateful for the same!

- Lorena Williams

As a professional, I must work on Outlook email for the wide type of official work and was completely stuck when I got to work on older version of PST file and had to compromise on my output. Then, one of my friends recommended this PST upgrade tool from SysInfoTools that worked well to easily convert ANSI PST to Unicode PST formatting.

- Dianna Welch

The best part of this software is the fact that it is a PST upgrade and Downgrade so that both conversion processes could be done in a single shot. As I could completely upgrade my PST to avoid corruption issue with this amazing tool similarly downgrade it at the same time.

- Ramon Weber

For the past few months, my Outlook had not been functioning properly as there was a PST file that became oversized, slowing down the performance. The PST upgrade and downgrade is the one that can be relied upon to be an authentic solution for up gradation purpose. Great product!

- Felicia Wells

It was great to have the polite customer support system resolve my queries instantly. I wanted to know about the system requirements of the software PST upgrade and downgrade and the customer staff directed me to the technical personal that explained to me in detail. SysInfoTools' customer handling is pretty good!

- Marta Turner