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QuickBooks is widely used for accounting and financial management by small and medium-sized businesses. One of its most useful features is Multi-User Mode, which allows multiple users to access the same company file simultaneously. However, when this feature fails, users often encounter QuickBooks Error H101. This error belongs to the H-series errors (H101, H202, H303, H505) and typically occurs when a workstation cannot communicate with the server hosting the company file.