Thanks, but I'm actually looking for a way to make OpenERP use the internal message function to automatically send invitations to meetings entered in the calendar, rather than sending an email. I'm familiar with manual use of the messaging system.

Do you mean "Super Calendar"?

no, just the calendar at Messaging/Organizer/Calendar. Super Calendar is just a module that combines the different calendars in OpenERP into one calendar view, isn't it? I haven't used it, but that's what it appears to be. What I'm getting at is the action that is triggered when you create a meeting that includes an invitation to another user. Rather than sending an email via the outgoing mail server (which is what OpenERP does by default), I'd like to replace that action with an action that sends an internal message to the invited user.

Super calendar can do more than that.

Well, that's great, but can it assist in addressing the issue outlined in the original question? If not, then mentioning it isn't very helpful.

Yes, off course, but it's 02 AM , and i promise that in a few hours i will do my best to try to show you how that can be achieved.

It's not clear in your description of how to use Super Calendar that an automatic message (not an email) is sent to users invited to the event. Does that happen?

My response followed your answer to my comment: when i asked: Do you mean Super Calendar? You responded: No, just the calendar at Messaging/Organizer/Calendar.

But this is not so important, now the new question is: How to trigger an action to send a message to some users, let's say 2 or 3 days before the date of the meeting.

This is what you exactly want.

Give me some moments, be patient and keep following this question.

No, no solution yet Federico. Don't forget to only use the 'Answer' function to provide an actual answer to the original question. If you just have a follow up question, use the 'Post a Comment' function. Thanks.