flowchart diagnostic tool??

I'm looking for an app that would let me build a flow chart to help our
customer support staff diagnose a problem. The current problem is fixing our
customers email problems, we(developers) put together a flow chart but its a
bit much and will grow into something large and hard to read way to quickly.
If I could have a clickable version that led our support staff down a
certain track that we could keep up to date I don't think it would be to
overwhelming to look at or use.


Any ideas?

Dan


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