Kopano active store misteriously changed to shared

Hello!
I am using Kopano with UCS. I had an user with active kopano account for testing purposes. I updated UCS to 4-3-3 release, as well as packages. Afterwards I tried to login with the test account mentioned above - it was not possible. I first thought there is something wrong with authentication, but login as another user was successful. Then I checked the Kopano Tab of the test-user account and saw that the store was set as Shared.
Is it possible that somehow this happened automatically? (may be a silly question but I cannot stop wondering)
Is there a log where I can see when this change happened?

Hey,

There’s the LDAP transaction log in /var/lib/univention-ldap/notify/transaction which contains one line per change with the DN that was added/changed/modified. More details such as which attribute was changed is only available if you’re running the directory logger which isn’t the default.

Kind regards
mosu