>Thanks for the info, So there is a difference with Office 365?

I don't think so. It works as always. I think they must launch the 32-bit processes to maintain compatibility with 32-bit apps.

> The problem is of course that we never know which version the client uses, So it was better to do smpt directly. We also use Catalyst, because they provide the tracer feature, which sometimes helped us a lot when there were peculiar network settings that prevented the emails to go out.

We have that problem as well, but our thinking has been that if Outlook can't do it, it probably can't be done. :-) Nevertheless, in our apps we give the user an option to choose "Use Outlook, "Use SMTP," and we allow gmail and yahoo and a couple others.

Some users have Outlook installed, but need to send official emails from a separate email address, so it needs to be setup distinctly for each user.