If Outlook is moving to freeze while merging large PST files, a better approach is to use a dedicated tool like
GainTools Merge PST Tool. It can Merge Huge PST files without using Outlook so there no chance of crashing or slowing down. The program lets you combine several PST files into one or combine certain folders while keeping the original data structure which includes emails, attachments, contacts, and calendars. It also works with all PST formats and keeps the data safe throughout the process, making it a safe and effective way to handle and combine huge Outlook data files.
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