Read/write excel and word 2007 documents from another application

[mco3006]

Hello,

I make a comparative analysis in order to decide which "method" to use to
access data in office documents from .net application.
Data should be both, read and written in word and excel documents!

There is ACE, COM and xml on the table...

Does anybody can give me a suggestion, hint or similar to make best list of
pros and cons for all three approaches?

Any help is appreciated,
Regards,
mco