[imp] run IMP under virtual server

[Steven Stern]

I have IMP happily running as

  https://myserver.com/horde/imp

When I tried to create a virtual server, webmail.myserver.com, horde and imp
got confused. The login fails with 

The requested URL /horde/imp/redirect.php was not found on this server.


<VirtualHost *:80>
   ServerAdmin  webmaster at myserver.com
   DocumentRoot /var/www/html/horde/imp
   ServerName webmail.myserver.com
   Options Indexes FollowSymLinks 
</VirtualHost>


How can I get horde and imp running under the virtual server mapping?
--
   Steve