3 lines Outlook preview

Hi all,
our client wants to write the 3 lines of Outlook Preview.
I followed the explaniation in this post: http://www.campaignmonitor.com/blog/post/1842/optimizing-for-gmails-snippets/ but it didn't work.

In outlook preview I don't see the ALT of explanation.gif but I see the first 3 lines of text version of campaign.

Any help?

Thank you
Andrea

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