Read this from a program manager for the MS Office team:
http://blogs.msdn.com/brian_jones/ar...12/438262.aspx

Quote: "We are by no means moving away from VBA though, which is why we
have the macro-enabled versions of the new formats. VBA is still very
important for a ton of our customers, and we will continue to support
their solutions going forward using the new file formats. "

If Microsoft dropped support for VBA, that might just be the catalyst
that pushed a lot of customers away from MS Office and toward Open
Office. They can't risk that.

So I wouldn't put any time or effort into converting exisiting code to
..NET, but it probably isn't a bad move for future work.

My $0.02,

Nick Hebb
BreezeTree Software
http://www.breezetree.com