The name is StickyMoss. Moss is short for Microsoft Outlook Send and Store; the software let's you choose an alternative to the "Sent Items" folder when sending an e-mail. I call it sticky because filing choices stick to an entire thread.
Deprecated: Send Log In Older Versions of StickyMoss
3-A reference copy is placed in Sent Items
2-User is Prompted to File the Sent E-Mail
1-Typical E-Mail; User Clicks Send
4-A reference copy as it appears in Sent Items