How to use MS Exchange Server in Linux.

Dear Sir,
In our company we are using Ms Exchange Server for the Mailing purpose and it works fine with Windows Platform but when I installed Linux 7.3 in my PC, there we can use Netscape Communicator 4.79 and Mozilla both for Internet Browsing. I configured my companies mail-id which we are using in the comapany and after that I can send mails through it but cannot Recieve it, we are using sslemail(secure). In netscape communicatot there is a option of sslemail. but still I am not able to receive mail in my comapnies account although I can send mails. Please tell me how to get mails thorugh Linux 7.3 using sslemail.
regards,
Manish.