Outlook user properties don't travel well over the Internet. At minimum
you'd have to send the item as Rich Text and hope that the format wasn't
changed when the items go out (a lot of local and server settings affect
that) and that the recipient was using Outlook and that the servers along
the way didn't strip out the TNEF wrapper that appears as winmail.dat when
things go wrong or the email is received by a non-Outlook client.

Usually people use x-headers if they want to send some property information
over the Internet. However, unless you are using Outlook 2007 and use
PropertyAccessor to produce the MAPI properties that will get translated
into x-headers when the item is sent out you can't use the Outlook object
model to produce the x-header. You'd have to use an alternate API such as
Extended MAPI or CDO 1.21 (not supported in managed code) or a 3rd party
library such as Redemption (www.dimastr.com/redemption).

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Bharathi" wrote in message
...
Hi,

I am inserting userProperty to the outlook mail using C#, but i am unable
to
view them when i receive the mail in gmail. Is there any way to insert
user
properties in outlook mail in such a way that I can view them from gmail?
I
am not allowed to use CDO 1.21 / Extended MAPI or Third Party software.

Regards,
Bharathi