From: Zoe Williams on
I have found that the organizer ('Allaboyina, Srinivas') will always
to see the "As the meeting organizer, you do not need to respond to
the meeting" message, I assumed this was because the event is coming
from them so Outlook thinks it must be in their calendar already. All
other recipients should be able to add the event to their calendar.

To get around this I just made up a do-not-reply email address and
used that as the organizer.
eg.
ORGANIZER:SOME NAME HERE<do-not-reply(a)DOMAIN HERE>

There is also a 'SENT-BY' parameter you could use if that works better
for your situation but I haven't tried it out.
ORGANIZER;SENT-BY="MAILTO:jane_doe(a)host.com":MAILTO:jsmith(a)host1.com
http://www.kanzaki.com/docs/ical/organizer.html

Hope this helps.