How to Restart the Microsoft Exchange Information Store Service
The core data storage repository for Microsoft Exchange Server 2003 is the Microsoft Exchange Information Store service, which contains both mailbox store and public folder store data. The Microsoft Exchange Information Store service uses a database engine called Extensible Storage Engine (ESE), which is a transaction-based database technology.
In some troubleshooting instances or when moving from mixed to native mode, you may need to restart the Microsoft Exchange Information Store service.
Procedure
To restart the Microsoft Exchange Information Store service
On the Start menu, click Run, type services.msc, and then click OK.
In the Results pane, find the Microsoft Exchange Information Store service.
Right-click the service, and then click Restart.