Will a Microsoft Office Add-In developed in Visual Studio work for both a Windows and Mac ( osx ) versions of Ms Office? I want to develop a Microsoft Office Word Add-In for Mac Users. I would like to know if we create it using Visual Studios in windows will it be compatible with the Mac version of office or is there a whole another way to develop for Mac?

Please provide links so that I could follow some guidelines. The http://msdn.microsoft.com/ site doesn't exactly speak of the platform compatibility of the Add-In.

Thank You very Much in Advance.
Office:Mac 2011 only supports add-ins that were developed in VBA.  Office:Mac 2008 does not support add-ins at all.  A new version of Office:Mac is slated for release in 2015, there have been no announcements as of this writing (December 2014) whether Microsoft will support additional methods of developing add-ins in the new version of Office:Mac.

For further information, check out Getting Started with VBA in Office for Mac 2011 from the Office:Mac 2011 help files.  You might find more assistance in developing Office:Mac add-ins in the Office:Mac help forums hosted by Microsoft.