Hi,

we recently started to use shared calendars. Shortly before that we changed the usernames from initials to lastname (in my case from ch to herzyk). There are, deliberately, no aliases with the old usernames on the server itself.
I must add that we have some useres using Outlook and some using the web frontend.

So today someone added a meeting to my calendar using Outlook. It showed up and I accepted it using the web frontend.
Now I got this error message in my mail:
Code:
This is the mail system at host zimbra.systrade.de.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<ch@systrade.de>: systrade.de

Attached to that I find a message from myself (herzyk@systrade.de) to my former address (ch@systrade.de). In that message my old mail address is listed as organizer.
Here is the meeting.ics file attached to this mail:

Code:
BEGIN:VCALENDAR
PRODID:Zimbra-Calendar-Provider
VERSION:2.0
METHOD:REPLY
BEGIN:VTIMEZONE
TZID:(GMT+01.00) Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
BEGIN:STANDARD
DTSTART:16010101T030000
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
RRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T020000
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
RRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:040000008200E00074C5B7101A82E00800000000C04EF3AF38CDC8010000000000000000
 100000000B5D16FF75ECC74C99BE231D4C4A8E93
SUMMARY:Annehmen: some random meeting data
LOCATION:
ATTENDEE;PARTSTAT=ACCEPTED:mailto:herzyk@systrade.de
ORGANIZER:mailto:ch@systrade.de
DTSTART:20080728T063000Z
DTEND:20080728T070000Z
STATUS:CONFIRMED
CLASS:PUBLIC
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
TRANSP:OPAQUE
DTSTAMP:20080613T090648Z
SEQUENCE:0
DESCRIPTION:Betreff: more meeting data \nOrganisator
 : ch@systrade.de \n\nUhrzeit: Montag\, 28. Juli 2008\, 08:30:00 - 09:00:00 G
 MT +01:00 Amsterdam/Berlin/Bern/Rom/Stockholm/Wien\n \n\n*~*~*~*~*~*~*~*~*~*
 \n\n\nJa\, ich nehme teil.\n\n
END:VEVENT
END:VCALENDAR

So how can my old address come in here?
When meetings are scheduled in the web frontend there are no problems.

Thanks

Christian