This post is short and sweet.

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Are you or your users only using the Zimbra web client? Do they complain about having no "mailto" abilities since they don't have a mail client installed on their machines?

Simple fix:  Add it to the registry!**

<strong>HKEY_CLASSES_ROOT\mailto\shell\open\command</strong> --- then the "data" for (DEFAULT) REG_EXPAND_SZ  is:  <strong>explorer "https://zimbra.yourdomain.com/zimbra/?view=compose&amp;to=%1"</strong>

<a href="http://egroup.jasonmangone.com/wp-content/uploads/2012/10/mailtoregistry.png"><img class="alignnone size-medium wp-image-7585" src="http://egroup.jasonmangone.com/wp-content/uploads/2012/10/mailtoregistry-300x110.png" alt="" width="300" height="110" /></a>

(picture of what my registry looks like)

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And there you go!

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(**Modify your registry at your own risk and take a backup first!)