Need a ticketing system that integrates to Windows SQL database

We have an old SQL database (maybe windows 2000), i would like to test some IT ticketing systems out there that can integrate with Windows SQL.
My ticketing system would need:
1- something to track sales leads and records
2- Billing
3- Open online tickets with internal views for our employees and external or public access for our customers
4- Knowledgebase
5 - Email notification
Is there any open source ticketing system that works directly with SQL, if not what commercial option are out there?
I have little knowledge on SQL but I would like to give some ideas to our DB administrator.
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You may want to look at Smarter Tools:

Their customer service software may be what you want.

From experience, though; I like the hosted stuff online like Freshbooks ( which can encompass everything from billing to sales to support tickets.

Best regards.
ticowarehouseAuthor Commented:
Great input, thank you
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