Making Bul changes to Group Types

Just what the Dr Ordered just needed to know the right group values and then have the confidence to bob it in and click Apply to see the changes

What method are you using to change this attribute? I ran a quick test using Manage 'Group Type', and was able to change the group type. There are probably a number of resources for the numeric values, but I used this one for my testing:

Value	GroupType
2	Global distribution group
4	Domain local distribution group
8	Universal distribution group
-2147483646	Global security group
-2147483644	Domain local security group
-2147483640	Universal security group

How do I complete bulk changes to group types, Partof the Migration to Exchange 2010 suggests the Distribution lists need to be Universal Groups therefore any which aren't I need to amend

When I select the appropriate groups It tells me a numeric value is required

What are the numeric values for each group type ?