Usage of 'will'

[Daemon99]

John: Do you know where James Street is?
Joseph: No, I don't. I think Mary will know. Ask her.

Is the usage of will in the above context fine? Does it mean that there's a good chance that Mary knows where James Street is. Can would be used in its place? Would it change the meaning of the sentence?
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Non-native speaker of English
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[Alan]

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Hi Daemon,

Good to hear from you again

'Will' here suggests that Mary definitely knows whereas 'would' suggests more that it's probable she knows.

You might like to look at this: http://www.english-test.net/lessons/20/index.html

Alan
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English as a Second Language
You can read my ESL story Only Three Letters