Tried in windows 8.1 64bit but may work in other versions
I tried to run caliber in system tray automatically during system start up for the caliber server to work and not to block the desktop by the full gui (all in one machine for Kodi, caliber server, sftp server etc acting as server and Kodi htpc) so I came with this script
1-enable caliber tray icon in caliber preferences/ look and feel
2-download batch and put in any place in your computer and create short cut of it and place in startup folder of computer
3-restart and try !!!
link of script:
http://www.mediafire.com/view/h3vt8owb4r7or6h/calibre_in_tray.bat