MSDB is one the System Databases in SQL Server. You might be aware that System Databases are important for the normal functioning of SQL Server. Here is a list of 12 areas in which  MSDB is used in a SQL Server deployment. 

• SQL Server Agent
• Backup and Restores
• Maintenance Plans
• Performance Data Collector
• Log Shipping
• Utility Center Point
• Database Mail 
• Database Mirroring
• Replication
• Policy Based Management
• SQL Browser
• DTS and SSIS Package Store

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