For those who want to start syncthing as a service under windows (7) using the cygwin environment here is a bash script that expects the syncthing exe under for personal directory/bin Start it using the cygwin bash shell and it stays silently in the background and logs in files.
#!/bin/bash
# wrapper script to syncthing executable
#set -x
DATE=`date +%Y-%m-%d_%H-%M-%S`
IDENT=`basename $0`
OUT="${IDENT}.out"
ERR="${IDENT}.err"
LOG="${IDENT}.log"
cd $USERPROFILE
./bin/syncthing.exe -home="${LOCALAPPDATA}/Syncthing" 1>>$OUT 2>>$ERR &
echo "$IDENT started at $DATE." >>$LOG
exit 0