tydeman, try booting os/2 from the Vista bootloader by adding a *BSD* entry in EasyBCD pointing to the OS/2 partition. Does that work?
After I got EasyBCD 2 beta working, I deleted and re-added entires.
The *BSD* entry (for the os/2 boot mngr) got me a blank screen with a cursor in the top left corner when I tried to boot it. So, that did not work.
Ok, so hold right there oint: Don't reboot that computer now that you set the (S) partition to "active" instead of the 7 MB partition. Now, while still in Vista, open up EasyBCD, go to the "Manage Bootloader" section, and with the "Reinstall the Vista bootloader" option selected, click on "Write MBR". Be aware that this will overwrite your eCS MBR with the Vista one, but that is the probably the better thing to do anyway in your case, to have Vista controlling the boot. I have had no experience with eCS or its bootloader, so I couldn't advise you on that, but I do know how to get OSes booting from the Vista bootloader, which would probably be best.
Too late. But, I did get back to a state where S: was active. I replaced the MBR as you requested. I can boot the Vista boot loader, which can then boot Vista. The Vista boot loader also can boot the Linux GRUB, which can then boot Linux. If I try to boot eCS boot mngr from the Vista boot, I get a blank screen with the cursor in the top left corner. Ctrl-Alt-Del gets me back to the Vista boot loader. If I then boot the Linux GRUB and have it set the eCS boot mngr partition as active and reboot, I get a blank screen with a cursor in the top left corner. Ctrl-Alt-Del gets me back to the blank screen (I no longer have a working boot loader). If I then boot a CD with DFSee, I can set the S: partition as active and boot the Vista boot loader. DFSee warns me that the MBR appears to not be a I13X capable one and that the eCS systems and eCS boot loader may not work.