vMail PST split tools help keep Outlook responsive by dividing oversized PSTs into smaller, manageable files, reducing corruption risk and easing backup and archiving. They typically offer modes like split by size, date, year, folder, or sender, and many work without needing Outlook open.​

What PST split can do

• Improve stability and performance when PSTs approach or exceed practical limits (commonly 50 GB in modern Outlook), helping avoid slowdowns and data corruption.​
• Create multiple PSTs using rules (by size/date/year/folder/sender), often preserving structure and supporting ANSI/Unicode files.​
• Operate offline without Exchange, sometimes handling password‑protected files with a valid password.​

What PST split cannot do

• It does not repair deeply corrupted PSTs; dedicated repair/recovery is required before or instead of splitting.​
• It won't reduce total data volume; it only reorganizes it into separate files users must manage.​
• Manual Outlook methods don't "truly” split automatically by size and are slow, risky, and require Outlook.​

Alternatives

• Archive/Auto Archive older mail to a new PST to control active file size.​
• Clean up junk/large items and export selective data rather than splitting.​
• Use a professional splitter when manual methods are inadequate or when Outlook isn't available.​

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