Dear,
The "i" on the envelope icon indicates messages that contain voting or
tracking information. If you send a message with voting or tracking
information, when the tracking information is triggered, the icon in your
sent items includes the "i." If you open these messages you will see a
Tracking tab that contains any tracking information. Actions that can trigger
voting or tracking information for a message include: • Sending a message
with voting buttons
• Sending a message and requesting a delivery receipt
• Sending a message and requesting a read receipt
• Recalling a message
The tracking information only appears when you receive a response. For
example, you send a message requesting a read receipt. The copy of the
message in your Sent Items folder does not include the "i" on the envelope,
nor does it contain a Tracking tab. When the recipient opens your message,
the read receipt is sent to you and the copy of the message in your sent
Items folder changes to include a Tracking tab and the "i" on the envelope.
To use tracking options you must format your message as rich text.
Read here for more
http://support.microsoft.com/default.aspx?scid=kb;en-us;192929
http://support.microsoft.com/default.aspx?scid=kb;en-us;235426
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Hope this helps you more
Regards
APK
