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At first I thought this could be an isolated problem, but several email from different sources are presenting the same problem. Whenever the email contains an (AFAIK malformed) youtube thumbnail URI, outlook 2010 (14.0.6112.5000 x64) hangs with this dialog on the foreground

The offending source code is

<img alt=3D"" border=3D"0" src=3D"//img.youtube.com/vi/7H_Xe2=5Ub0k/hqdefault.jpg" style=3D"display: block; border: 0;" width=3D"200">

Interestingly enough, this image displays fine when viewed via webmail (google apps).

  1. Shouldn't out look treat this link just like any other broken link and not hang ?
  2. Why does the URI work on webmail but not for outlook?
  3. Any suggestions on a temporary workaround?


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update: problem comes and goes. it hasn't happened in months now. –  Gaia Oct 23 '12 at 12:04

3 Answers 3

According to http://social.technet.microsoft.com/Forums/en-NZ/outlook/thread/008aa82d-f186-494f-b4af-12828be1750e, the fix is to switch to Outlook 2013.

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Amazingly enough, that is the answer (which is actually NOT a answer, but what else can we do? M$ never ceases to amaze me...) –  Gaia Oct 23 '12 at 12:03
up vote 0 down vote accepted

This is a bug in Outlook (prior to and including 2010), as documented here. When an image points to a non-existing network share (instead of a web server), Outlook’s “Internet picture blocking” functionality doesn’t kick in and Outlook still tries to retrieve the content in a foreground thread, which causes it to stall for about 1 minute.

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One "solution" is to edit your hosts file to map img.youtube.com to your local IP address ( so it fails instantly, rather than taking 1 minute to fail to find \img.youtube.com.

In my case the emails had an image attempting to load from //feeds.feedburner.com blocking that network location is rather severe though if you run an RSS reader.

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