1998 system still running
Visited a small engineering company last week, to review their request for an order management system.
The current system is using Lotus Approach - the about screen showing 1998 and references to 'Year 2000 updates' (from memory - seems a bit early to be thinking of 2000). So it's been in use for 20 years.
It's still running and the advice was "If it ain't broke, don't fix it".
To be fair - it is running on a Windows 7 machine - so something has been updated in the meantime.
We are going to fix it though - they use QuickBooks and there are add-ons which do all they want, integrated into QuickBooks. So recommendation is to move to this.