Hi, I've installed IM on one of the Exchange 2000 servers. I have verified all the settings with Exchange 2000 documentation and it seems OK. I couldn't see any events related to IM in server's application logs. I'm receiving below error on w3svc log file on server. 2002-07-19 11:49:22 172.16.32.110 - 172.16.32.129 80 SUBSCRIBE /instmsg/aliases/ketanp - 403 - While logging into exchange using IM from an XP client, I receive below error. Exchange Instant Messaging Authentication Failure The person logged on to this computer does not have permission to use the specified e-mail address. Please type your e-mail address and password. Can anybody help me? Thanks. Regards, Ketan Pandya Technology Infrastructure Services Mastek Ltd ' 91 22 695 22 22 Extn 1672 7 91 22 695 11 11 * <mailto:ketanp@xxxxxxxxxx> ketanp@xxxxxxxxxx MASTEK Investing in relationships In the US, we're called MAJESCO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from all computers. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~