How to Mailbox storage limits in Outlook Without Deleting Emails?

[mukeshnailwal]

To increase Outlook mailbox size without deleting emails, you can modify the mailbox storage limit manually. Here’s how:

1. Modify Registry Settings:
   • Press Win + R, type regedit, and press Enter.
   • Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\XX.0\Outlook\PST (Replace XX.0 with your Outlook version).
   • Create or modify MaxLargeFileSize (for UNICODE PST) and WarnLargeFileSize.
   • Set the values in MB (e.g., 100GB = 102400MB).
   • Restart Outlook to apply changes.
2. Use Outlook Archive Feature:
   • Go to File > Options > Advanced > AutoArchive Settings.
   • Configure to move old emails to an archive file, reducing main PST size.

Challenges​

• Risk of PST Corruption: Expanding PST size beyond default limits may cause corruption.
• Performance Issues: Large PST files can slow down Outlook.
• Complex Registry Edits: Incorrect changes may cause system instability.

Increase Outlook Mailbox Size Using DRS PST Splitter

1. Launch the DRS PST Splitter Tool and add the oversized PST file.
2. Select Split Criteria (by size, date, sender, etc.).
3. Choose Destination to save the split files.
4. Click Split to create smaller PST files, maintaining data integrity.

Using DRS PST Splitter prevents corruption, ensures seamless accessibility, and improves Outlook performance without modifying registry settings.