Thank's MA, it's a great suggestion.

Since I'm coding for a NT platform, it requires VBS installed, and then I might as well do the whole thing in VBS where it's known to work.

However it got around the failure; Luckily you can create an import file and import it to Exchange.

I created an importfile with the new addresses, and then made the script import the file to Exchange, - it works.

Thank's to all for chippin in.