Hello All, Am facing a problem with the meeting requests received as plain mails. The scenario is we are sending meeting requests using plain .net code which is generating ical and sending meeting invites. My client having an environment mail server "Exchange Server 2007" and their internal users receive the mail using the Out Look 2010. Meeting requests are working fine over there which are sent internally. Problem is occuring with the mails sent my application. The user is receiving the ical as an attachment showing as "not supported calendar message.ics". Please share your thoughts on this. Thanks. Rajani.J

Hello Rajani, From your description, seems your message format is not supported by Exchange 2007 Server, you need to check on your custom application, make sure the meeting request sent from your application is supported by Exchange 2007. Thanks, EvanEvan Liu TechNet Community Support

Hi Evan, Am not sure what should be the format of ical which is supported by Exchange server 2007. Following is the format which is generated by my application: BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:Meetings CALSCALE:GREGORIAN METHOD:REQUEST BEGIN:VTIMEZONE TZID:India Standard Time LAST-MODIFIED:20120928T091004Z BEGIN:STANDARD DTSTART:20120826T000000 TZOFFSETTO:+0530 TZOFFSETFROM:+0530 END:STANDARD BEGIN:DAYLIGHT DTSTART:20130901T000000 TZOFFSETTO:+0530 TZOFFSETFROM:+0530 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT SUMMARY:testing mail ORGANIZER:MAILTO:spq@abc.com ATTENDEE:some@abc.com LOCATION:loc DESCRIPTION:testing mail desc DTSTAMP:20120928T143930Z UID:8C695DA2-564C-41C2-B1FB-337F84486D4B SEQUENCE:10 URL;VALUE=URI:http://abc.com/Lists/Meeting Request/DispForm.aspx?ID=313 DTSTART;TZID=India Standard Time:20120928T150000 DTEND;TZID=India Standard Time:20120928T160000 END:VEVENT END:VCALENDAR Can you please guide me what am i missing in the above format ? Thanks.Rajani.J

Hi Evan, Am not sure what should be the format of ical which is supported by Exchange server 2007. Following is the format which is generated by my application: BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:Meetings CALSCALE:GREGORIAN METHOD:REQUEST BEGIN:VTIMEZONE TZID:India Standard Time LAST-MODIFIED:20120928T091004Z BEGIN:STANDARD DTSTART:20120826T000000 TZOFFSETTO:+0530 TZOFFSETFROM:+0530 END:STANDARD BEGIN:DAYLIGHT DTSTART:20130901T000000 TZOFFSETTO:+0530 TZOFFSETFROM:+0530 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT SUMMARY:testing mail ORGANIZER:MAILTO:spq@abc.com ATTENDEE:some@abc.com LOCATION:loc DESCRIPTION:testing mail desc DTSTAMP:20120928T143930Z UID:8C695DA2-564C-41C2-B1FB-337F84486D4B SEQUENCE:10 URL;VALUE=URI:http://abc.com/Lists/Meeting Request/DispForm.aspx?ID=313 DTSTART;TZID=India Standard Time:20120928T150000 DTEND;TZID=India Standard Time:20120928T160000 END:VEVENT END:VCALENDAR Can you please guide me what am i missing in the above format ? Thanks. Rajani.J

Hi All, The issue is resolved. Following is the iCal format which i have generated: BEGIN:VCALENDAR METHOD:REQUEST PRODID:Microsoft CDO for Microsoft Exchange VERSION:2.0 BEGIN:VTIMEZONE TZID:India Standard Time X-MICROSOFT-CDO-TZID:11 BEGIN:STANDARD DTSTART:16010101T020000 TZOFFSETFROM:-0500 TZOFFSETTO:-0600 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010101T020000 TZOFFSETFROM:-0600 TZOFFSETTO:-0500 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20121003T101154Z DTSTART:20121001T183000Z SUMMARY:attachment issue UID:{48876a57-429a-4585-9513-4d03cd327f54} ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="abc ":MAILTO:abc@cn.com ACTION;RSVP=TRUE;CN="abc":MAILTO:abc@cn.com ORGANIZER;CN="User1":MAILTO:user1@cn.com LOCATION:test location DTEND:20121003T183000Z DESCRIPTION:attachment issue\\N SEQUENCE:1 PRIORITY:5 CLASS: CREATED:20121003T101154Z LAST-MODIFIED:20121003T101154Z STATUS:CONFIRMED TRANSP:OPAQUE X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-INSTTYPE:0 X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-CDO-ALLDAYEVENT:FALSE X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-OWNERAPPTID:-1 X-MICROSOFT-CDO-ATTENDEE-CRITICAL-CHANGE:20121003T101154Z X-MICROSOFT-CDO-OWNER-CRITICAL-CHANGE:20121003T101154Z BEGIN:VALARM ACTION:DISPLAY DESCRIPTION:REMINDER TRIGGER;RELATED=START:-PT00H15M00S END:VALARM END:VEVENT END:VCALENDAR Article helped me: http://weblogs.asp.net/bradvincent/archive/2008/01/16/creating-vcalendars-programmatically.aspx Thanks Every One. Rajani.J