SysInfoTools Home / Products / MS Outlook Tools / PST Upgrade & Downgrade

PST Upgrade & Downgrade

Highly-developed innovational software

PST Compress & Compact Box
PST Upgrade & Downgrade is the most comprehensive Windows utility programmed for upgrading as well as downgrading Outlook email client from old to new latest versions and new latest versions to older ones. 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, still you can 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 are allowed to 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

Check out the most prominent features of PST Upgrade & Downgrade software:


PST Upgrade
Upgrade Outlook

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 format into Unicode format with ease. By upgrading Outlook, you can increase the mailbox size limitation of PST files from 2 GB to 20 GB.

PST Downgrade
Downgrade Outlook

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 in that.

Batch conversion
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.

Search pst
Auto-Search PST

Don’t worry if you have no 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.

log file generation
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.

Add outlook to PST
Add PST to Outlook

Users are allowed to 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.

Remove deleted items
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)..

Remove duplicate items
Remove Duplicate Items

Also, 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.

Safe Apllication
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.

Easy to use
Easy-to-use Application

The interactive user-interface makes this software highly convenient and easy for non-technical as well as complete novice users. It requires no prior technical knowledge to use this software. Online video tutorial and snapshots would be helpful in this regard.

High Support
High Supportability

Software highly 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.

Wide compatible
Wide 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. If your PST files are corrupt, you need to repair them first with the help of PST Repair software.
  • Also, if your PST files are password-protected, first unlock the PST files with the help PST Password Recovery software.

PST Upgrade & Downgrade becomes 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. In order 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 in order to increase the size limitation.

PST Downgrade

Downgrading PST means converting PST from Unicode to ANSI format. If you’re downgrading Outlook from newer to older version, you must convert Unicode to ANSI PST. Unicode PST file is supported by Outlook 2003 and later versions. PST file saved in Unicode format has maximum 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. In order to open a Unicode PST file in Outlook 2002 or any earlier version, you must convert it into ANSI format.

Watch Online Video & Procedural Screenshot Software

Frequently Asked Questions

Comparision of Trial & Full Version

Product Features Free Version Full Version
Convert Ansi PST to Unicode PST and Unicode PST to Ansi PST files check mark check mark
Maintain all email meta information check mark check mark
Attach new PST files in outlook profile check mark check mark
Support password protected PST files check mark check mark
Save Upgrade & Downgrade files 5 Items(Each PST file) All
24*7 Tech Support & secure 100% check mark check mark
Price FREE $59
money back policyMoney-Back Guarantee
Feel Free to Purchase SysInfoTools Products! We are committed to 100% customer satisfaction & security and thus we provide 30 days money back guarantee. View details...
Download Buy Now

Clients Reviews

"As 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. Thus, Thanks 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 have to 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 there one of my friends then recommended me 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 comes from the fact that it is PST upgrade and Downgrade so that both the conversion process can 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 was not functioning properly as there was PST file which became oversized and slowed down the performance.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’s great to have the polite customer support system that resolved my queries instantly. I wanted to know about the system requirements of the sofwtare PST upgrade and downgrade and customer staff directed me to the technical personal that explained me in details. SysInfotools customer handling is pretty good!"

- Marta Turner