[otrs] OTRS is slow

hi all i have loads of e-mails in my system and my system has become really slow. i am running OTRS on windows server 2003. i would like to know how i can clear the database by deleting all the closed tickets. i want to know if this will help increase the system speed? thank you _________________________________________________________________ "Post ads for free - to sell, rent or even buy.www.yello.in" http://ss1.richmedia.in/recurl.asp?pid=186