From: Mick on
I was having the issue described below with Vista and Outlook 2007. Other
posts stated it was a machine wide configuration setting that became
available when you right clicked the Outlook icon and selected "Run as
Administrator".

This made perfect sense except it didn't help me. The checkbox was still
disabled. I tried so many different things and then tried right clicking the
Outlook icon, selecting "Run as Administrator" while holding the CTRL key
down to start in Safe mode. My left eye was half closed and I was holding my
breath and UAC was bravely enabled - yep, I'm perservering but that's another
story.

Finally, after several hours and much cursing, the little checkbox to not
prompt for opening a JPG attachment was enabled. I removed the tick with a
sigh of relief and it no longer annoys the hell outa me.

After this, the checkbox was always available when running Outlook as
Administrator. I back tracked, enabled antivirus, enabled RSS feeds, enabled
all the addins, rebooted, sneezed once and could no longer reproduce the same
issue.

I think, by design, the checkbox is disabled for users (even local admins)
but "should" be enabled when "Run as Administrator".

Hope this helps someone somewhere.

> >> "You should only open attachments from a trustworthy source"
> >> The checkbox to disable the message is greyed out.
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