QuickBooks Desktop logs program messages and errors, including information created by Verify, Rebuild, and Condense Data utilities, in a specific file. In Windows, the file is called QBWin.log while for Mac, it is called QuickBooks.log (applies to US only). These logs are helpful in determining the cause of certain errors in QuickBooks or in your company file.

Note: Errors like "IsQBInUseLockFilePresentAndLocked...LCK can't be found. Error = 2" in QBWin.log is not a sign of data damage and should not be considered as one when troubleshooting data damage.