Something like Wine would rob M$ of control, unless they were actively involved in it's development. New / updated M$ products would need to run on Wine (if they officially supported it), which would decrease the flexibility of what M$ could do... (and they wouldn't like that).
Besides, I think the idea is to put out Linux versions of M$ products (which would run on the "shim" middleware), not just make Windows versions of M$ software run on SUSE... This would give M$ the freedom to put out lesser Linux versions of their products (for more revenue potential and market share), with full versions only available for M$ platforms (Windows).
Something like Wine would rob M$ of control, unless they were actively involved in it's development. New / updated M$ products would need to run on Wine (if they officially supported it), which would decrease the flexibility of what M$ could do... (and they wouldn't like that).
Besides, I think the idea is to put out Linux versions of M$ products (which would run on the "shim" middleware), not just make Windows versions of M$ software run on SUSE... This would give M$ the freedom to put out lesser Linux versions of their products (for more revenue potential and market share), with full versions only available for M$ platforms (Windows).
Note: This post is 100% speculation.