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Tell me what it runs on.
Three questions, then whatever else you want to say. I read every one myself and reply in plain terms: whether I can help, roughly what it costs in time and money, and what I would do first. No sales call, no deck.
What happens next: I reply by email, usually the same or next working day, with a straight answer. If it is a fit, the first step is a short read of the code and database — a fixed, bounded piece of work at a fixed price, ending in a written account of what the system does and what a move would take. You keep that document whatever you decide.