Configure automatic password change (SharePoint Foundation 2010)

http://technet.microsoft.com/en-us/library/ff607826.aspx

To configure managed account settings by using Central Administration

1. Verify that the user account that is performing this procedure is a farm administrator.
2. On the Central Administration Web site, select Security.
3. Under General Security, click Configure managed accounts.
4. On the Managed Accounts page, click Register Managed Account.
5. In the Account Registration section of the Register Managed Account page, enter the service account credentials.
6. In the Automatic Password Change section, select the Enable automatic password change check box to allow SharePoint Foundation 2010 to manage the password for the selected account. Next, enter a numeric value that indicates the number of days prior to password expiration that the automatic password change process will be initiated.
7. In the Automatic Password Change section, select the Start notifying by e-mail check box, and then enter a numeric value that indicates the number of days prior to the initiation of the automatic password change process that an e-mail notification will be sent. You can then configure a weekly or monthly e-mail notification schedule.