This problem may be caused by a configuration problem in a hybrid deployment. I've got a headscratch of a problem with outlook classic However when he assign the user the relevant permissions, they can only see free/busy.
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Searching tricks to resolve the calendar not opening
Read this guide to fix “calendar not opening” issue in hybrid exchange via exchange management shell.
The default permissions determine the kind of free/busy information that users in a remote forest can see.
