QuickBooks Error 6073 99001 occurs when QuickBooks cannot access the company file because it is either in use by another user or the file is locked. This error often happens in multi-user environments or due to improper network settings. To fix it, ensure all users have closed QuickBooks, check file permissions, and verify only the server has hosting enabled. Renaming the .ND and .TLG files and running the QuickBooks Database Server Manager can also help. For persistent issues, use QuickBooks File Doctor or consult QuickBooks Support to avoid data loss.

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