My decision would be to stay with the UNIX system and avoid developing a new one. Although redesigning the previous system would cost time and money, I think that starting from scratch involves more time and effort, especially from the senior management level. I assume that Casa del Libro can afford costs associated with UNIX and staying with UNIX will not lead them into huge losses/debts. I also assume that Casa del Libro is striving for excellence based on their aggressive projections, buying the "bestinbreed" technology and hiring prestigious consultants.
My decision is based on the following criteria:
1. UNIX is robust and can sustain a huge number of transactions. Of course this is not relevant at the time of the decision as the market declined, but it will enable the firm to avoid future problems when the market starts growing again. It's always ups and downs and definitely this was not a market that had matured and close to an end.
2. Designing a new platform from scratch, even if it's relatively cheaper and simpler, would still involve high costs unless they could use at least the technical specifications for the UNIX to design the Windows NT.3. UNIX is more stable and in online shopping you wouldn't want any downtime.
4. Microsoft might seem to be cheap but most probably they'll keep selling you updates every month or so.
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