Share Outlook calendar between 4 PC's on non domain network

What would be the best method of sharing global calendar between 4 users who are all using Outlook. Small office, no Exchange, just 4 PC's with Outlook. Anything that would sync online?
I tried Yahoo Sync (as they have a Yahoo acount) but it would not work.
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I would keep it Google (no Outlook needed). Just use the browser. Phones are nicely synced also.

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paulmac110Author Commented:
I have been requested that Outlook be the calendar sync. Anyone kbnow how to get Yahoo sync to work with outlook>?
paulmac110Author Commented:
Any other calendars I could link with Outlook?
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