You can get SysInspire OST to PST converter software. This tool can fix Outlook OST cannot be opened error. It has PST split option users can split PST file into multiple small sizes. It has a demo version that can allow users to convert 25 items from each folder. It can recover deleted mails and convert them into PST file format. It supports all versions of Windows OS. This tool does not require Outlook to open an OST file in users PCs. It has technical support users can get help by mail or live chat. It can convert OST files in bulk at the same time.
Consider using eSoftTools OST to PST recovery program. This program converts OST to PST. With a single hit, this tool recovers the OST file. This tool identifies corrupted emails and converts them to a PST file automatically. This program supports a variety of file formats for converting OST files. This utility is compatible with all versions of the Windows operating system. To view the OST file, you do not need to install MS Outlook on your computer.