Received 2 appointments, same date, same content, just different hours. Since then I receive message from iCal: Access to “Subject” in account “iCloud” is not permitted. The server responded "403" to CalDAVWriteEntityQueueableOperation. It's a bug!

This didn't solve my problem and I still have the problem, because this customer send me again messages, facing again the error message.

I realize also which seems to be the problem.

My customer use Lotus Notes and just the changed appointments have different syntax, which the iCal server doesn't accept.

I tried to import those appointments in Outlook for Mac and Outlook have no problems with this appointments. Just iCal.

What helped you doesn't help me, and even if this could be the wokarround, this is not an accapetable solution, always signing in and out when receiving changed appointments from Lotus Notes server.

In my opinion the other solutions refer to same standard just iCal not. But we are not living on a island with Apple products.

It took time find out what kind of system he is using. My customer doesn't care about those details. He just want to know if I'm there or not.

(a) Lotus Notes is sending the appointments and (b) my Mac is receiving the invitation.

I got now your direction. It's not a lot I know about.

For the mass-mails he have to manage he never consider to use MS Exchange and other "independent" Provider he will never use, because of security reasons. I just know he introduce „MK Email Client Policy Management" for Lotus Notes (ECPM), to manage the correspondence.

In those issues I don't assist them. This is not my métier.

But you are right, I will find out more details about.

Thanks for your encouraging words. I still can see your biting smile writing this words. ;-)

Thanks for the smile. I supose I need a truck full. I feel already handicapped.

Yes, my customer is using Domino and so far I understood him they also introduce IBM Lotus Quickplace/Quickr (first time I hear about) as Collaboration suite, which include some Domino agents and administration tools for the Domino databases. This was for migration reasons on one hand and the collaborations issues could be further integrated and supported in the future infrastrcuture.

Still it's not understable for me why it's not possible to adjust the syntax for a such tiny application like calendar. If IBM don't move, it's no reason for all others to do the same. This is not mikado (the game with the pick-up sticks - who move, have lost). This can't be a such big deal?!

Outlook for Mac can handle the invitations. Why not this modern, fantastic, visionary and handy iCal?! Maybe some of the mentioned attributes are missing in the base of the tool.

Yes, I can.

Sorry for my last very short answer, I had to leave very quick. I appreciate a lot your assistance!