Hello,
Yes, there are differences, not in columns but in data it will accept.
MS Exchange can raise an exception if for example an email address is wrong formated.
Problem is, the exception is raised not during setting the value, but during the save of the whole Item, so we are often not able to detect which column is the problem.
Try to unlink first the address related columns like Organizer, Attendees etc., most problems with MS Exchange are email formatting problems.
Try then to load, if it works, link again the address columns but one by one to be able to detect what the problem is.