I'd like to pass the Email.message.Cc to a Data Action, but I want to have the collection separated by a semi-colon (e.g. address1@domain.com; address2@domain.com). If I use "ToString()" it's obviously separated by a space.
The ToString method accepts a second parameter for collection - to specify the delimiter: ToString(myCollection, ",")
You can find info on ToString and the different overloading in Architect Expression Help when typing/selecting ToString.