everyone who works in an office has this problem: after some months on the job, you start getting messages from IS, or IT, or whatever the heck that department is called at your place of work, telling you that you are at your allotted server limit in stored e-mail and you need to clear space.
wtf?, you say. i need these, damn it! i've already deleted what i can! i've moved what folders i can to archive, but...auuugh!
here's the tip:
do not, ever, organize by subject or project. you will be working on those for ever and ever, amen or termination. it will be a massive, huge, ginourmous pain in the arse, but organize by year then month. if you know you have a set group of projects every freaking hour, day, week, month, year, just create a subfolder for each month for that project. it will take a lot of time to set up, but it will make your e-mail so much easier to archive.
so, main folders for years
2006
2007
2008...
then subfolder in those years for each month
april
may
june...
then subfolders to the months for each project, be it case number or client number, what have you.
create a folder for the current year in your archive. when the current month closes, move it to the archive folder for that year.
this way, you'll have only the current month's e-mail on the server, which means you get fewer notices from IS/IT/whomever. make sure you set up quick access to your archive, which is best kept on a server drive than your harddrive (just in case).
believe me, this will save you a lot of time and trouble in the long run, my little メロンパンs. in this matter, trust your モチ先輩, for she is wise and practical, office-wise. in all other aspects of life, however, she continues to suck.