Exchange 2010 - email address policy

Moving Ex2003 to Ex2010 and have upgraded the Default Email Address policy but it simply is not being applied.
Firstly when I create a new mailbox (using EMC) the 'alias' is not auto-filled in, which I thought it would from the default email address.
Also when I create a new user (who is a member of staff) they get an email address based on the 'Staff Email Address Policy ' I created (firstname.lastname) but not on the default which should just be 'alias'

It is saying applied - true, has 'lowest' priority' and did not have any managed folder details on it when migrated.
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BusbarSolutions ArchitectCommented:
This is because the one you created has a higher priority, try to create a new one other than the default and apply it to the selected users, you can for sure change the priority between custom policies but not the default one

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PeteAuthor Commented:
but surely a user has the policies applied to them depending on the groups they are in, so a member of staff gets the 'staff policy' and next on the list is 'default policy' which gets applied to all mailboxes.
why is the priority important here?
BusbarSolutions ArchitectCommented:
I believe that users getting the wrong email address got the 2 policies applied, can you confirm that by checking the email tab and see the email assigned to the user
PeteAuthor Commented:
i think I have misunderstood the way it works, will test tomorrow, but correct me if i'm wrong:
- a staff member in the staff OU will only get the 'staff email address policy'
- any other user not in the staff OU will only get the 'default email address policy'
so if I add as a further email address format in the staff policy they will then get both.
BusbarSolutions ArchitectCommented:
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