Sharepoint2010 Errors: HTTP Error 503. The service is unavailable in SharePoint

Preconditions

Windows Server 2008 virtual machine with sharepoint server 2010  installed on it
We required Outlook express client to be setup on the Windows server virtual machine and for that we changed the Window login password.

Error:

HTTP Error 503. The service is unavailable in SharePoint


Resolution:

This error is normally encountered when a user changes the password for the account. So to correct the error follow the below steps:

Go to Start -> All Programs -> Administrative Tools -> Internet Information Services (IIS) Manager.Then Click on(+) beside the server name -> then Application Pools ->then locate your application pool and Right click on the Application pool name and click on Advance settings -> Under the process model tab ->Identity-> Click on the Identity ->Set -> a dialoguebox appear inwhich you enter the user name, password and confirm password. At times the services are also turned off so turn them on ;).

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