How Do I Split Up PST File in Outlook Without Losing Emails?

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If your Outlook PST file has grown very large, splitting it into smaller files can make the data easier to organize and manage. The key concern is ensuring that emails and their associated information remain intact during the process.
To split up PST file Outlook data safely, first create a backup of your original PST file. You can then use Outlook's available data-management options or a specialized PST Splitter Tool, depending on your requirements.
A dedicated splitter can provide options to divide PST files according to size, date, year, or folders. When evaluating a tool, check whether it preserves emails, attachments, formatting, sender and recipient information, timestamps, and the original folder hierarchy.
If you need to split PST file into smaller parts, avoid modifying or deleting the source file until you have verified the resulting PST files. Open or inspect the generated files and confirm that important folders and messages are available.
Using a suitable splitting method with a backup and post-process verification can reduce the risk of accidental data loss while making oversized PST files easier to handle.