I've been using GTD with the Outlook Add-in software for awhile. (Love it.)
One problem I have with using Outlook as my "trusted system" is that it gets full (mailbox over quota). I do regularly delete and archive, but it's not enough.
It occurred to me that automatically saving all my "sent" mail may no longer be necessary, since I so often use the Add-in's "Send and Action" button. However, I'm a bit nervous about giving up that safety net of saving everything I send, at least for awhile.
What do you all do?