Since I bought Office 365, I must say I'm very happy with the product. But I'm having a problem regarding some Excel sheets I made (of astronomy) which used a personalized dll.
Whenever I try to run the application, I get that the code of the project must be updated to the 64 bits system, and that I must mark the Declare functions as PtrSafe. If I mark them, the error disappears, but the code doesn't run, like if didn't find the dll, or the dll was invalid.
As far as I undertood, this is a very common problem in programmers that updated the Office to the 365.