My company does not use iCloud, but will need a company-wide iCal calendar that everyone can make changes to. If I'm not mistaken, iCal server is the second best option. My company uses Rackspace to host our email client, and so far I have not been able to set up a Sync-able iCal using the Rackspace server info (email/password/server name). I repeatedly am told that the info I gave was insufficient for establishing a secure connection. What are some ways I can resolve this, or at least set up a company-wide calendar that does not rely on iCloud?
Yosemite 10.10.3
