If you have created one or more email accounts through Plesk and have webmail enabled, you can change their version from Horde to Roundcube and vice versa. To make this change, follow these steps:
1..Log in to myTophost Panel and then click Plesk Login to login to Plesk
2. Select Mail from the left menu and then Mail Settings
3. Select the domain for which you want to change, the Webmail button, from the drop down menu select horde or Roundcube and finally select OK.
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