CoolUtils OST to PST Converter was developed to convert offline OST to PST files, which appears to be one of the best ways to avoid data loss. Because OST files are associated with Microsoft Exchange Server, the safety of data contained in them depends on the server's performance. Should the server crash, all data will be lost irrevocably.
To avoid this situation, many users convert OST files to PST format, which is similar yet much safer. There are dozens of software tools that you can use to convert offline OST files. CoolUtils OST to PST Converter is the safest, most compact and most affordable one at the moment.
This program converts OST files without a possibility of errors or corruption. All resulting files are well organized and can be opened via Outlook email client.
How to Convert OST to PST
Download the converter and view the dialog.

There are only three options, and that's all that you need to manage your emails properly:
Select Source OST and specify the OSTs, which you need to convert to PST
Select Destination and specify the folder, in which you want to save your PST files.
Finally, select Process to review your selections and launch the process.
As you can see, this converter is apt to recover all data from your source OST files, regardless of the PC, which was used to create them. You can recover emails, attached files, tasks, calendar, etc.
Another big advantage of this tool is that it is absolutely ad-free.
If you have downloaded the evaluation version of this converter, you can spend 30 days testing it. When this period expires, you will be offered to purchase the license key, which you are going to have to buy to continue to use this program. Considering the converter's effectiveness, we can say it is really worth the price it goes for!