Wiscmail Sucks, Lots of SPAM

I hate using Wiscmail now. With the amount of spam and unrelated mailings from other University departments, I wish I could get the mails in Wiscmail get forwarded to my other accounts. That's why I use Thunderbird to check my wiscmail for new messages only, and I won;t have to view the junk mail folder.
After I graduate, I'll lose my account and all me emails and attachments along.
What's the point of keeping them all tight together now when you know they'll be gone in the near future?