Unable to view shared calendar entries performed by others in Outlook 365

I consult for a small firm that has 4 users.  They have been on a MS Small Business Server 2003 that was configured by somebody who is no longer at the firm. A couple of years ago, I migrated them to a pop email solution so that I could eventually remove the server, as it was unnecessary to maintain or upgrade it for 4 users.  The problem was they had 2 shared calendars that everyone could access with full rights.  One was shared by the owner and another was a telephone log that was in Public folders.  So I had to have 2 email accounts configured on everyone's Outlook - one pop and the other Exchange.  This weekend I upgraded them all to Outlook 365, Office 2013 local installations.  I was able to export/import both calendars and have shared them out from the owner's mailbox as per all documentation I have read.  The owner's calendar is working perfectly and shows up in everyone's "shared calendars".  The telephone log calendar, however, shows up in "other calendars".  Both calendars are visible to everyone in Outlook.  The problem is every time the owner adds an event to the telephone log calendar, it only shows up in his Outlook and his OWA, and is not visible to the other 3.  The other 3 users, however, add events to that calendar and they all show up in all 3 of their Outlook and OWA, but do not show up in the owner's.  The strange part about it is that the owner gets pop up reminders of all of the events he cannot see.
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Vasil Michev (MVP)Commented:
So you've shared a subfolder in his mailbox? One thing that comes to mind is to check whether those events are marked as Private. Other than that, some sync issues I guess...

Why dont you just use a shared mailbox or Public folder calendar? Both should work and wont cost them anything. Here's an example article on how to create PF Calendar: https://www.cogmotive.com/blog/office-365-tips/create-a-company-shared-calendar-in-office-365

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