In Dynamics CRM the "SystemUser" entity doesn't have a field that has the information whether a user is enabled or disabled. This solution adds a "IsEnabled" field that is of bool type that will hold the information. You can add the field to a view. The solution come with a plugin that will update the field every time a user record is created or updated.
A set of custom actions for SharePoint workflow which further extends the workflow capabilities, (you can send plain text emails while customizing From, Reply To and BCC fields, send meeting request, or set item level permission through your workflow).