Serial

+ Added fixes and improvements for serial port emulation including full 9-pin support. This should allow greater compatibility with various serial devices (Mac OS X only).
+ Made serial port preferences window completely interactive. Also detects the attachment of any USB serial adapter while the "Settings..." window is open in Mac OS X. Virtual PC now detects the removal of serial port(s) and defaults back to 'none' when this occurs.
+ Serial port will no longer disappear from the COM Settings panel when the window is opened and USB is enabled.

USB

+ Automatically resume a USB device if packets are detected being sent to a suspended device. Allows the LinkSys WAP11 USB configuration utility to work.
+ Fixed USB connection issues in both Mac OS 9 and Mac OS X that caused crashes on plug-in and un-plug of a device.

Misc.

+ Added scripting support to allow debugging of blue-screen events in Windows XP.
+ Fix for MatLab 6 (max [1 2] calculation) so it returns the correct result.
+ Fix for rounding results in CallAtlanta program.
+ Fixed an issue in Mac OS 9 that caused a crash when the hard drive and CD drive were spun down (slept) and a call was made to the drive from Virtual PC.
+ Fixed an issue with reading Joliet CD formats under Mac OS 9.
+ Changed behavior of incompatible or corrupted saved states so that the user is asked before the state is deleted.
+ Fixed an issue with Folder Sharing ®¢ the MacÕs free drive space is now correctly reported by Windows 9x OSes.
+ Allow multiple users in Mac OS X to run Virtual PC and share preferences and drive images. This will also allow the drive image and preferences to be moved into the Virtual PC application folder and placed on a removable drive for increased mobility.
+ New Virtual PC Additions

We installed the 5.0.2 updater on our 450 MHz G4 Cube and 500 MHz PowerBook G4 and encountered no problems. This time authentication did not fail on the PowerBook in Mac OS X as it did with the initial VPC 5.0 installation. The installer for new "Additions" automatically appeared when we launched each Windows virtual machine (Windows 95, ME and XP) and were installed without drama. After a reboot we ran the various Windows versions and they appear to run much faster under OS X in limited use. A lack of reasonable speed has been the biggest complaint about the Mac OS X version of Virtual PC. Those complaints should diminish, particularly for Windows 95 and ME virtual machines.