an example of a multi-day email thread would be something like:
"RE: Fenics PNL Wrong (DO NOT EDIT THIS:257337)"
the tag in parentheses indicates a production issue, and the number is its id. The subject line in the beginning may or may not change over time, but the "issue" is still tied together by the id.
These sometimes take multiple days to resolve, and at the end of a week or more, I'd like to tag the whole conversation with something like:
Tag: Production Support, Fenics, Reporting
Notes: issue#257337, wrong PnL
I might also tag other activity (db queries, instant messages, etc) with the same tag/notes combination.
It's uncommon that this exact combination of notes will come up again, so a persistent AutoTag would not be appropriate: it would be too specific, and doesn't do notes, anyway