ActiveSync, OWA, EMC and IIS stopped working in Exchange Server 2010

When ActiveSync in Exchange Server 2010 becomes inoperable due to unknown reason, other applications that are linked up with Active Sync may become non-functional as well. In my case, I have stumbled upon where smart devices stopped synchronizing to Exchange Server 2010, Outlook Web App (OWA), Exchange Management Console (EMC) and Internet Information Services (IIS) also became inoperable.  Note that Microsoft Outlook is fully operational.


  • Navigate to C:\Windows\System32\inetsrv\config, locate applicationHost.config and rename to applicationHost.config.old

applicationhost location


  • Replace the file C:\Windows\System32\Inetsrv\Config\Applicationhost.config from a backup.
  • Open a command prompt and run iisreset to Reset the IIS Service.

iisreset command

Now, test the email flow from a smartphone. Access the OWA, open up EMC and IIS. They should all start working and be fully functional.

HTTP Error 503. The Service is unavailable – SharePoint 2010

Note:  This Tutorial is based on SBS 2011 Server – Sharepoint 2010 and it will also work on Windows Server 2008.

Have you seen the HTTP Error 503 in your browser when you’re trying to access your SharePoint site?

Here are the possible resolutions:

Option 1:  Make sure that all SBS Sharepoint application pools are “Started” and not “Stopped”.

To do this, locate Information Services (IIS) Manager (click on Start then Administrative Tools) from the Windows Server (SBS 2011 or 2008). Select Application Pools, then locate all SharePoint application pools, if they need to be Started, go to the Application Pool Tasks pane and select Start.

Application Pools - Services

If Option 1 didn’t help resolve the issue…… proceed to the next Option.

Option 2:  In the Application Pools Properties, select SBS Sharepoint AppPool, select Advanced Settings….

Error 503 pic1

In the Advanced Settings properties, go to Process Model, go to Identity and click on

Advanced Settings

In the Application Pool Identity properties, go to Custom account then Set… then change the Username and Password.

Application Pool Identity

Now, try to access your SharePoint site on any browsers and see if error 503 has disappeared.