Today one of our task boards hit this:

No worries, we’ll just follow the link and increase the limit. That however takes you to Customize the Task Board Page for Visual Studio 2012. From what I have done previously I knew this would not apply to TFS 2013. The command is to export the agile process config and in 2013 this has all been combined to be the one process config. Looking through my process config though I could not find the IterationBacklog element, so I run the command anyway and get:

In the 2013 process config, although there is not an IterationBacklog element, there is PortfolioBacklog, RequirementBacklog and TaskBacklog. The same attribute workItemCountLimit still applies and it goes on the TaskBacklog element. The details can be found in Configure and customize Agile planning tools for a team project.

The steps however are very simple:

1. Export your process config
   

   witadmin exportprocessconfig /collection:http://tfs:8080/tfs/DefaultCollection /p:TeamProject /f:ProcessConfiguration.xml

2. Add workItemCountLimit attribute to your TaskBacklog element

   <TaskBacklog category="Microsoft.TaskCategory" parent="Microsoft.RequirementCategory" pluralName="Tasks" singularName="Task" workItemCountLimit="800">

3. Import your modified process config
   

   witadmin importprocessconfig /collection:http://tfs:8080/tfs/DefaultCollection /p:TeamProject /f:ProcessConfiguration.xml

Note that the default is 500 and the maximum allowed is 1500.