Distribution lists in outlook are not in "to" list

This may be an easy question to answer but I don understand why this has happened.  I have a user that was just upgraded to a new windows 7 32bit machine from an xp machine.  The user ha outlook 2007 on both machines. When she clicks on contacts in the left hand pane under "all outlook items", their distribution lists show there.  When the user click "to" when composing an email those distribution lists are not showing up in the list.  How can i correct this?
techitch2Network AdminAsked:
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PietMuisCommented:
techitch2Network AdminAuthor Commented:
OK i will try this but all her contacts show in the address book....just not distribution lists that are in her contacts....FYI.
Raymond PengSystems EngineerCommented:
How is she creating the DLs?  Can you confirm the personal DLs are listed within Contacts?
If you right click contacts > properties > under Outlook address book > is there a tickbox that says 'show this as an email address book'

DLs should be created within contacts.

Another thing to check for is latest Office service packs and windows updates.

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