Although obvious to anyone who has been following the computer industry for years, there has been little meaningful discussion of the core reason for the recent Sun/Microsoft copulation - Linux.
The City of Calgary is an interesting demonstration of why Sun has been bleeding dry and why they were happy to work with their arch enemy - sheer desperation. The City recently switched from high-priced unix servers from Sun and HP to low cost Intel boxes running Linux and had seen significant cost-benefit in a very short time.
Sun itself is divesting itself of Sun hardware, as they recently laid off over 500 engineers working on the UltraSPARC chipsets. If you have an old Sun-based system, I suggest you look at migrating to another hardware platform, soon.
The University of Winnipeg Library is in the process of migrating all our Solaris and Windows systems to Linux as well. The only remaining holdouts are the ILS (running on Sun hardware) and a records management system (Windows). We hope to move the ILS system (III's Innopac) to Linux before the end of the year as well. The records system will remain on a Windows server for a while longer, but we are hoping Omnirim will port their system soon as well. When we do I will report back on the cost-efficiencies our small Library has experienced with the move.