One thing I have always found a little bit odd about Microsoft’s Dynamic CRM is once you have made a new field, business unit and many other things you cannot change value’s on it.
I’m not entirely sure what goes on in the background and what is setup but clearly the name of the variable is used to setup security or privledges, it must be the name rather than the ID because you cannot change it. It doesn’t seem like good practise to me but its where we are.
in CRM 4, once you created a business unit you could never get rid of it, so you better not misspell it.
But CRM 2011 allows you to delete the business unit, not that I have been deleting any business units but I did read it in the latest Customer Effective Blog
Say Goodbye to Abandoned Business units in CRM 2011
This is one of those useful changes to know but I hadn’t seem mentioned anywhere.
The customer Effective Blog for those who aren’t subscribed to it is a great source of interesting and useful CRM information
Hosk's Dynamic Blog 
What’s interesting to note is that the current eLearning course for CRM 2011 Customization and Configuration still contains old information from CRM 4.0:
“Double-check the name and spelling of each business unit before saving the record. Business unit names cannot be modified, nor can records be deleted once the record is saved.”
This can potentially very confusing to the uninitiated…
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