Yes, there is a possibility of file corruption when using tools to join multiple PST files but the level of risk depends largely on the method used.
When combining PST files manually using Microsoft Outlook the risk of corruption is usually low if the process is performed correctly. The manual method typically involves creating a new PST file and importing data from other PST files into it. If the original PST files are already broken large enough or the import process is stopped because of a power outage or a system crash. Importing big files can make Outlook freeze or stop working which can sometimes cause data to be unreliable. To minimize risk it is strongly recommended to back up all PST files before starting the manual merge process.
Using a professional tool like
GainTools Merge PST Tool, on the other hand & is meant to lower the chance of file corruption. This tool makes a new PST file that combines the original files without changing them. They also have built in ways to keep the email properties. They also manage large or multiple PST files more efficiently than the manual method. There is very little chance of corruption as long as the software is used correctly and the system stays stable during the process. Still, it is always a good idea to make a backup first."
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