VSTO addin for VS 2008 targeting Office 2010 applications

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VSTO

I am currently using the addin "Visual Studio 2005 Tools For Office Runtime" and carrying out the development in VS 2008.. I am targeting Office 2003 applications using this setup.

Now my client wants to move to using Office 2010. Is there an add-in available that would enable me to target Office 2010 apps while I continue to use vs 2008? or I need to have vs 2010 for that?

Also what should be the approach to migrate our current VSTO project which uses VSTO 2005 add-in and targets Office 2003; to the new VSTO addin for Office 2010.. is migration possible or we have to simply re-develop to target office 2010 now?

Thanks,
Pankaj