Many of our users have shared calendars that other users access through the Calendar (iCal) application on their Macs (all Mac office).
The sharing permissions are usually set so that all users may view a calendar and only one group can edit. Not every calendar is shared.
To make sure the calendars appear for the assistants, we go into the assistant's webmail, load the share calendar there, then go to Settings > Folders to Sync and make sure the calendar is checked in the CalDav section. They have their account loaded into Calendar as a CalDav account and it displays all CalDAV folders that are checked folders to sync.
This morning, I've had 5-6 users who start up their calendar and see none of their shared calendars - none of those shared calendars that are set to sync. Looking at their webmail, it seems that ALL of those caldav folders to sync have become unchecked.
After seeing this with a couple people, I began checking other accounts. It wasn't happening in every account. But now, some of the accounts I'd checked earlier today have had all their CalDAV folders spontaneously change to unchecked for syncing.
I haven't found any log errors or anything else that seems related, and we haven't run any updates to our Kerio server (Kerio software or otherwise).
If anyone has any clue about what could be causing this, it would be a big help!
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