What's up with Windows 10 calendars?

My dad has been experiencing problems with Windows 10 calendars. It periodically deletes all old saved items, clears the history. My dad would like to retain his calendar as a record of what happened when.

He had devised a work around using Word to create his own calendar, but I’m wondering what is up. Checking the Windows help site I was able to uncover numerous complaints on this topic from dozens of people.

Unfortunately, Windows 10 does not provide an actual help line. All it has is a comment section that is not patrolled and has no official response.

Nobody has a clue?

I had a possibly similar issue a while back, and noticed there was more than one calendar profile with checkboxes next to them. I realized the wrong profile was selected, and found the missing events by correcting this.

I still don’t know how the selection got switched in the first place, I’m the only user on that device. My best guess is an inadvertent change on another device and a consequent networked change as a result. Pure guess, though, and only relevant if this is a profile issue on your father’s computer as well.
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Thanks. I’ll have him check.