New answers tagged outlook
It might involve a workflow on the SP list. Make the WF trigger on change/create of the field and the n update a value in a dropdown based from your "Category" field. If Category A change dropdown field to A Else if Category B change dropdown to B and so on... build more ifs and then populate your dropdown in SharePoint.
I found a solution here: http://msdn.microsoft.com/en-us/library/office/ms457051%28v=office.14%29.aspx It can be included in Group Policy.
If you create a task in a task list then the assigned to user will have a task on outlook form them. You could just send them an email then this should be able to get the desired result. Tasks Integration with Exchange for SharePoint 2013 How to sync & show SharePoint 2010 task items created by workflow in Outlook 2010
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