Will I lose emails from error 0x80040600?

Usually not. Run ScanPST.exe to repair the .pst file before making any other changes.

Where is ScanPST.exe?

Find it in your Office installation folder, usually C:Program FilesMicrosoft Office ootOfficeXXSCANPST.EXE.

Outlook error 0x80040600 means your .pst data file is corrupted. Use ScanPST.exe to repair it without data loss.

Will I lose emails from error 0x80040600?: Usually not. Run ScanPST.exe to repair the .pst file before making any other changes.
Where is ScanPST.exe?: Find it in your Office installation folder, usually C:Program FilesMicrosoft Office ootOfficeXXSCANPST.EXE.