>Thanks to all of you! Thank goodness it's the same as before, was to lazy to test since I've been crazy busy but good to know that it's pretty much same code as pre-2007 excel.
>
>The only thing that you need to worry about is if you are implementing any of Excel's interfaces for use with the EVENTHANDLER() function. AFAIK, the interfaces for Excel changed between Office 2K and Office 2003 and again between 2003 and 2007.

Which breaks a cardinal rule. An interface should NEVER be modified once it has been implemented. That breaks code. Instead a new interface should be created, inheriting from the previous interface. I guess Microsoft figures even cardinal rules don't apply to them.