prompt to file mail

is there a way to get outlook to prompt a user to file a sent message?

also prior to upgrading to exchange 2010, I was using public folders as a
collabrative mail store for various projects, so we had a folder called live
jobs, and then a number of sub folders listed by the job number so for
example jh242, jh243, jh244 and so on.

I am told that exchnage 2010 does not like this, but how do I enbale my
project teams to have a shared mail folder where they can all file the e-mail
for each job they are working on?

I appreciate this may be more of an exchange question, so sorry if I am
posting this in the wrong place