The act refers to “any record”, so if a document is not removed from your inbox and there's an access request, you have to provide that document; it's part of the record.
The policy under the Treasury Board of Canada is that you can remove transitory documents, and you should keep documents that have business value. That's really dependent on different decisions; some people will keep all the drafts that led to a decision, especially if they show the way the decision was made.
It's really a case-by-case situation, but right now I think a lot of people are keeping everything just to make sure that they don't...you know, where there should be better policies and better directives, or maybe a legislative definition of an official document, so that people know what they're supposed to do and what their responsibilities are.