Microsoft Dynamics CRM Interview Questions

A few weeks ago I went to an interview for a position of CRM developer, these are the questions that I was asked:

1. What are the differences between Plug-in and a Workflow?
2. When will you use a workflow and when will you use a Plug-in?  
3. What is CRM Discovery Service?
4. What is 'Append' and 'Append To' privilege in MSCRM?
5. Suppose if I have 20 user license and I have created 20 users. What will happen if I create 21st User?   
6. What are the maximum number of tabs allowed on a Microsoft Dynamics CRM 4.0 form? 
7. How to Debug the javascript that we write for some validation on entity pages.

These were found here, the first google hit on "dynamics crm interview questions"

The final question was essentially the chart on this post. The dialog part had been removed and I had to fill in what applied to plug-ins and what applied to workflows.

I thought that this had already been asked in question 2, but there you go.

I wasn't very impressed by their selection procedure, alas they did not offer me the job.