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Single Single-On with NT Domain and Exchange 5.5?

By Kinglunker ·
I've had a few associates state that they have single sign-on capabilites in an NT domain structure with Exchange 5.5. This means, once authentication has occured into the domain (through Windows login after the machine boots up) - they do not have to provide their username and password again when opening Outlook to access their Exchange 5.5 mailbox.

I'm perplexed at this - considering there is no kerberos involved here, I don't see how this is possible. Can anyone shed any light on this topic?

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NTLM

by lowlands In reply to Single Single-On with NT ...

Exchange does not only support Kerberos, it also supports NTLM authentication.

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Forgot about that...

by Kinglunker In reply to NTLM

...and as well the simple fact that in Exchange 5.5 you can configure the mailbox to use the NT Domain account for authentication (as opposed the Exchange directory). So I can see where non-Kerberos SSO is possible.

Thanks.

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