Hi From 2days before my Exchange's POP3 service failed suddenly....It means when i am trying to download the mails from the exchange the mail clients of every node hangs at authorization but when i am restarting the excahnge it is working fine for 10 to 15 mins then the problem rerises. I am using SBS2000 (Exchange2000). Before some days I had installed GFI Mail security on it(Freeware Version) for testing. Due to some problem I had removed it. After the next day this problem arises. I have a 512MB Memory and 1200MB Virtual Memory. There is only 25 mail users for this machine no other application software is running on that machine. But the Memory and CPU usage is going hingh after 10 to 15mins and giving error you have not suffient virtual memory in ur system. NAV 2001 is installed previously. Is there any virus problem........ Any advice will be appreciated Thanks ____________________________________________ Brajesh Ranjan Panda System Administrator Divas Offshore Software Technologies (P) Ltd. N-1/3, DLF Phase-II Gurgaon-122002, INDIA. Mobile:-9891744174 Telephone: +91-124-501880-1 to 8 Fax/Voice-mail: +91-124-5018044 Web: www.divassoftware.com ____________________________________________