I am currently using a third party mail service and have several hundred distribution groups. I want to export/import the groups along with all the users in them into Exchange 2010. I have seen some posts that show you how to create many distribution groups with a script, as well as posts that show you how to add users to 1 group. So currently the plan is to populate all of the groups, and then 1 by 1 I will have to go through each to add users, this seems very daunting. Can anyone suggest a better way to approach this?

You could use LDIFED Utility or VBScript to export, import, and modify object such as users, contacts, groups, servers, printers, and shared folders. Step-by-Step Guide to Bulk Import and Export to Active Directory Introduction to CSVDE -i Bulk Import http://support.microsoft.com/kb/237677 http://support.microsoft.com/kb/327620 You just need to create multiple LDIF filesPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.