How to increase pst file size in outlook 2016 regedit?

📂 Increasing PST File Size in Outlook 2016 via Registry

1. Press Win + R, type regedit, and press Enter to open the Registry Editor.
2. Navigate to:
   HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST
3. Right-click → New → DWORD (32-bit) Value. Name it:
4. MaxLargeFileSize (for max size limit)
5. WarnLargeFileSize (for warning limit)
6. Set the value in MB (e.g., 51200 for 50 GB) and choose Decimal.
7. Close Regedit and restart Outlook.

Caution: Always backup the registry before editing. Large PST files can affect Outlook performance.

More info: Microsoft PST size limits.