This is something that lots of people I deal with want disabled. By default MS Exhcnage 2010 Web Outlook will display a warning about displaying images. This is part of enchanced security that is very good for lots of people, however some users who understand the risks but want to disable this warning and display images in web based Outlook generally strugle to find the middle ground – that is enable this for some users but not others.
Unfortunately Microsoft does not seem toprovide individual settings, still worse you have a choice of either disbale it totally, enable it all the time or just live with the default of warning message and related clicks.
In any case there is also a not so easy way to disable this setting – like it or not you must use PowerShell for Exchnage to reconfigure the related web server. Thus there is a command that needs to be issued to enable or disable the filter:
Set-OwaVirtualDirectory -Identity "ServerName\owa (Default web site)" -FilterWebBeaconsAndHtmlForms DisableFilter
Obviously you will need to replace the virtual directory and server name with whatever you system uses/is.
Conversly to enable the filter back on:
Set-OwaVirtualDirectory -Identity "ServerName\owa (Default web site)" -FilterWebBeaconsAndHtmlForms UserFilterChoice
or lastly to force it on all time with no prompt (that is disable images and maximize the security):
Set-OwaVirtualDirectory -Identity "ServerName\owa (Default web site)" -FilterWebBeaconsAndHtmlForms ForceFilter
Hope this helps someone out there.
Some related links that may be of help: