asterisk users - May 2007 - Asterisk vs. Shoretel

Hi,
Someone who has had experience with shoretel VoIP systems, can you please
give me a run down of how Asterisk is either better or worse?   I am
completely unfamiliar with Shoretel systems, but someone had suggested we
look into them.  I said, you bring your Shoretel features, and I'll show you
10 things Asterisk does or can do that Shoretel doesn't do.  I still believe
that's possible....however, I thought I'd shoot an e-mail out here to
see
what experience others have.
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