Setup duplicate hardware and use something like Double-Take from NSI Software or WANSync/WANSyncHA from XOsoft, which are the two most popular packages for this functionality. This setup will not provide zero down time, because the failover process will take a certain amount of time depending on your network and hardware. On average, about 20 seconds, which is pretty good. ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of William Francis Indra Sent: Wednesday, April 19, 2006 10:09 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Backup Server Dear All, We need to deploy one exchange 2003 server as backup for our primary exchange 2003 server. The purpose of this deployment is to keep the down time is ZERO. In case our primary server is down, the backup exchange 2003 server is automatically up to replace the primary exchange server role.. Anyone can help to deploy this backup exchange 2003 server ? William Francis Indra l IT Officer | PT Global Informasi Bermutu | Wisma Indovision, level 17 | Jalan Raya Panjang Z/III | Jakarta 11520 Indonesia | tel: +62-21-582-8555 ext. 1733 | fax: +62-21-582-4414 This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. PT GLOBAL INFORMASI BERMUTU ("Global TV") (including its group companies) shall not be liable for the improper or incomplete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. Global TV (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference.