outlook 2003 rpc over http client does not connect to exchange 2007 server (but outlook 2007 does connect)
Posted on 2009-02-18
i have a mixed moded exchange 2003/2007 setup and in process of starting to migrate users mailboxes from 2003 to 2007 mailbox server
I have moved 1 test mailbox from 2003 to 2007 and used to be able to access it from both outlook 2003 and 2007 both using mapi and rpc over http.
i have tried to implement an ISA 2006 solution but ran into network layout issues and have abonded the project and am going back to a simple 2007 exchange setup without ISA
i have now run into the issue where outlook 2007 users with mailboxes on 2007 exchange server can connect both via map and rpc over http (from outside the LAN) but i have a 2nd laptop which i use for testing and for the same mailbox i run an outlook 2003 client and this client cannot connect to the 2007 exchange server
OWA access works fine from both laptops, the certificate is also installed correctly (else owa wouldn't work and outlook 2007 neither)
when running outlook (2003) with /rpcdiag i can see it is trying to connect, i enter the username and password but the login box just keeps popping up time and time again, when the outlook 2003 client is on the lan it connects without any problems to the 2007 exchagne server so it is a pure rpc over http issue between outlook 2003 and exchange 2007 (which used to work)
i have checked on the exchange server that:
1) all outlook client are allowed to connect
2) certificates are installed okay
3) mapiencryption is set to false
4) mapiblockoutoutlookrpcoverhttp is set to false
5) outlookanywhere authentication is set to basic
i can connect to owa using same hostname and double checked the exchange proxy settings are exactly the same on the outlook 2003 and 2007 client, when pinging the hostname it resolves to the same ip address
has anyone come accross this issue before and or know what to check to resolve this issue?