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Hi BerndS88,This issue could be caused by numerous reasons. Dear Mouran,Thank you so much for your detailed list of possible root causes.I didn't have time yet but it seems that I found the reason for the problem. It was a ' Shared calendar' from a client Sharepoint that I connected to my Outlook using another Outlook account (created bymy client's IT department).Thank god I found it.
Since I just deleted it, I can just assume that this should've been the problem. If it wasn't I'll get back to you.Also I'd like to apologize for my long response time. I'm quite busy at work and I wasn't able to go through your list and answer quicker.Again, thank you all very very much for your help!Best regards,Bernd.
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