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If Outlook user attached category (Red, Blue, etc) while sending mail to Thunderbird user then sent category should be displayed to Thunderbird user and Vice-verse, It should be globally.

So how to configure that , what Tag should be look at Outlook mail header ?

Update 1:

I can see following content in outlook email header :

Subject: Test Mail
Date: Tue, 3 Sep 2013 20:11:52 +0530
Keywords: Red Category
Message-ID: <002101cea8b3$be4a5d40$3adf17c0$@com>
MIME-Version: 1.0

But when I send mail to other email client then it's not showing any Keywords.

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