Best OST to PST Converter Software of 2021 – Review of 5 Tools

OST to PST Conversion can be the need of the Outlook users when Exchange Server goes to be down. Therefore, they should go for five best OST to PST Converter Software for exporting emails from OST file into PST format, which is describe here.

MS Outlook is one of the basic requirement of every big or small organization. It is much-liked email client from other available email clients, as it allows users to save email files even when they are working offline.

Basically, Outlook saves data on Exchange server in two formats and that is (.ost) and (.pst). Both file formats store many of your important data like email, contact, notes, task etc. If in case the Exchange server got corrupt with any due reasons then there are might possible chance which can affect Outlook and makes it run extremely slow.

Why We Need to Convert Outlook OST to PST Files?

Suppose, if there is some kind of issues in Exchange server or corruption had taken place. Then we need to convert our email from OST file to Outlook PST file format. Also, OST to PST conversion is needed when Outlook users shifts from one office to other and you have the backup of only of your OST files unless you have the access to your Exchange server.

There are quite a few programs on the market that claim to be capable to convert OST file into PST file format smoothly and securely. But here is a question, that everyone wants to know like, Are they really safe to use? also, do they all really work as what they actually claim and describes themselves? So, here in this blog, I have mentioned all those which have successfully passed our test.

Top-Rated Five Tools to Convert OST Files into PST File Format

When I thought to have a note 5 best OST to PST Converter Tools, I ended up with these 5 tools. I have tried all of them and had a thorough analysis of their features and performances. Here I am listing top Free Online OST to PST tool along with their pros and cons.

  1. Aryson OST to PST Converter
  2. SysinfoTools OST to PST Converter
  3. Stellar OST to PST Converter
  4. SysTools OST to PST Converter
  5. Kernel for OST to PST Converter

Aryson OST to PST Converter

This tool has acquired its place at the top of my list because of its success rate as compared with others. Although it had just came into the market of OST to PST software but performance wise I found it to be the best. Let us put some light on its features, pros, and cons.


  1. Successfully convert all email items of Outlook mailbox including emails, contacts, calendars, attachments etc from OST (offline) to PST file format.
  2. Completely safe and secure platform for OST to PST conversion
  3. Effectively convert normal as well as damaged and corrupt OST file
  4. Allow users to Export OST emails to Mac Mail


  1. Does not support any other OS apart from Windows
  2. Does not support OST files conversion to Office 365

SysInfoTools OST to PST Converter

SysInfoTools is serving best tools since 2010 and OST to PST Converter is one of the best tools among them. It is basically developed with the ultimate conversion algorithm which can easily convert any corrupt and damaged files just in few seconds.


  1. It can easily convert OST file into PST, EML, MSG, MBOX, DBX, and Archive format
  2. Developed with intuitive GUI and user-friendly interface
  3. Allow users to search and locate Offline OST files in your system
  4. Help users to preview migrated OST files before the complete conversion process takes place
  5. Compatible with all MS Outlook versions


  1. Demo version does not allow to convert more than 25 emails
  2. Unable to exchange OST files directly to the Exchange server

Stellar OST to PST Converter

This software is much advanced as it allows multiple extra features and completely safe for OST to PST Migration. Let’s check it out its Pros and Cons


  1. Convert OST file to Office 365
  2. Save scanned information in the form of DAT file, that help users to save
  3. It strongly supports the conversion of multiple OST files in a single shot.
  4. Allow users to split and compact the files and save them into PST file format.


  1. The corporate edition is only available for a single user
  2. Batch conversion is supported only by technician edition
  3. Compatible with only Windows

Cigati OST to PST Converter

This software captured its 4th position in my collection as it is also safe and secure platform to convert OST file into PST format. Users can blindly rely on this software as well.


  1. Support multiple saving options along with batch conversion capability
  2. Restore even deleted OST file from offline OST mailbox
  3. Can import OST file to Exchange Online
  4. Compatible with all versions of MS Outlook


  1. Only support Windows-based Operating system.
  2. Demo version only allows generating preview and export 25 emails items per folder.

Kernel for OST to PST Converter

Kernel OST to PST Converter retrieves user mailboxes from orphaned OST files very smoothly and firmly.

  1. Recover permanently deleted Outlook mailbox items
  2. Restores Exchange emails to Gmail/ accounts
  3. Refine your data items based on item type, data range, folder name etc
  4. Generates the graphical report of the total items migrated from OST to PST file format


  1. The trial version of Kernel OST to PST Converter tool can only convert 25 emails from each recovered folder
  2. It supports only Windows-based Operating System


I have listed the best OST to PST converter tools which are masters in converting OST files into PST file format easily and firmly. It is not necessary to use only these tools, although you have an option of manual conversion.

Never forget to keep a backup of your complete data, as a backup is the king of digital scenario. By this habit, you will never face any problem in the near future.

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