How to Manage the Report Server Unattended Execution Account
The System Center 2012 – Operations Manager Report Server unattended execution account is used to query data from the Reporting Data Warehouse. Users that manage this account require only the Read user right. This account is not managed from within the Operations Manager user interface. Use this procedure to change the user name or password for this account.
To manage the Report Server unattended execution account
On the Windows desktop, click Start, point to Programs, point to Microsoft SQL Server 2008 R2 SP1, point to Configuration Tools, and then click Reporting Services Configuration.
In Reporting Services Configuration Manager, in the Report Server Installation Instance Selection dialog box, click Connect.
In the navigation pane, click Execution Account.
In the Execution Account pane, type a new user name or password as required.
Click Apply, and then click Exit.