Horde webmail : Content Encoding Error (content_encoding_error) !!!

[Rock]

Mostly, customers from the middle east countries face this problems while opening the Horde Webmail interface:

Content Encoding Error (content_encoding_error)

Server response could not be decoded using encoding type returned by server.
This is typically caused by a Web Site presenting a content encoding header of one type, and then encoding the data differently.

For assistance, contact Customer Support.

To get this fixed, follow the below mentioned steps :

Find the Horde config file 'conf.php' on the server:
which can be normally found in this path: "C:\Inetpub\vhosts\webmail\horde\config\conf.php"

Search for the following in that config file:
$conf['compress_pages'] = true;

Change it into:
$conf['compress_pages'] = false;

Save the horde config file & restart the webmail client. And.... you're done