Hi, I have been doing some testing on Excel 2010 and testing out the 32 bit addinn application(which contains vba addins, c++ libraries and VB libraries). And this seems to be working fine with 32 bit version of office and as expected its not working with 64 bit version one. Can some one confirm that to work with office 2010 64 bit, any client application (all dependant components-vb,vc++,vba etc)should be converted to 64 bit? Or will there be a support for 32 bit application by default when 64 bit Office get released? Any suggestion here will be highly appreciated as we need to plan to support our internal and external clients when O2010 get released. Thanks in advance!