Yes you can purchase it separately. Pre Outlook 2003 have some minor issues but they do work.
You have to decide.
http://www.outlook-tips.net/howto/vista.htm
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Peter
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"anne" <anne RemoveThis @discussions.microsoft.com> wrote in message news:EDAF1D99-F9F3-4739-B25B-4233103B755E@microsoft.com...
> can outlook2007 be purchased separately from office and then be installed in
> vista. If not, are there any issues with installing outlook in vista from
> the xp/2000 os
> thanks