This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.
Serial mice and ps2 mice do not use the same type of communication. Some mice can detect which type of port they are connected to, and adapters for these are not standard. Consult your specific mouse manufacturer to find out if an adapter is possible, and the necessary pinouts.
Microsoft and Logitech have produced mice useable in serial and PS2 ports. Connecting diagrams/details may be found at http://asustek.asus.com.tw
 
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