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unable to connect outlook to our exchange

Our current environment is exchange 2007; we have just installed exchange 2010 to coexist in the same domain to we can upgrade.

OWA works find on the exchange 2010 box and 2007. I am able to create users in 2010. And use OWA to send emails from it. But I am unable to connect outlook to our 2010 box.. I get an error message, "outlook could not be log on. Check and make sure your are connected to the network" I can ping my exchange 2010 box by name and IP.

Also when i tried to telnet, i was able to get through but when i do the command
mail from:user@compnay.com
i get 5.7.1 client was not authenticated. But this user is able to log on to the 2010 owa and send out emails fine.

I am not sure what I’m missing can anyone please point me in the right direction

thank you very much

SOLUTION

Raghuv

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markdmac

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TonySt

I had this very same issue with outlook 2003 and exchange 2007. The outlook machine cannot resolve your exchange servers name. (ie: exchange_server_name.local) I resolved this by listing the exchange server's IP address in the DNS listing for that system.

sirichaiphumirat

ASKER

thanks everyone!! the shell command worked