You can set the following system-wide preferences:
- The number of lines displayed on the pages containing lists (i.e.: list of domains, list of clients, etc.),
- Default interface language and skin that will be used for control panel sessions initiated by other users,
- Administrator's interface language and skin,
- Allowance of multiple simultaneous sessions under administrator's login,
- Checking for mailboxes passwords in the vocabulary to ensure they are not easy to guess,
- Apache restart interval: defining this might help decrease the Apache web server downtime, especially, if you have a large number of user accounts and domains hosted on server.
- Server-wide statistics parameters.
To set the server-wide preferences follow these steps:
Click the
Preferences icon on the Server administration page. The Server preferences page appears: 
To set the number of lines per page, enter the value into the appropriate input field. The maximum value can contain not more than 4 digits. Entering zero will enable Plesk to display all entries at once on a single page.
To set the default interface language, and the language for your interface, select the needed language from the drop-down lists.
To change the way your Plesk 7 system interface looks, and to set the default skin, select the desired skin from the drop-down lists.
To allow multiple users with login name 'admin' access and manage the system, check the Allow multiple sessions under administrator's login checkbox.
In order to ensure that the mailboxes passwords are not easy to guess, select the Check the passwords for mailboxes in the vocabulary checkbox.
To set the apache restart interval, enter the desired period in seconds.
Specify the statistics retention time in the Retain traffic statistics for ...Months field.
For the Plesk 7 system to know whether to take into account log files, databases, mailboxes, tomcat web applications, mailing lists, and domain backup files when the disk space usage statistics calculation is carried out, specify the necessary options by putting the check marks in appropriate fields.
To adjust the traffic calculation procedure, at the Include in the traffic calculation section, use the appropriate radio button to select from the inbound and outbound traffic, only inbound traffic, or only outbound traffic settings.
Click OK to apply all the changes made.
You may replace the default Plesk logo in the top banner area with your own logo. This provides you with a customized look for your interface. Also, it enables you to hyperlink the logo to your organization's web site. To change the logo on the interface, follow these steps:
Click the
Logo Setup icon on the Server administration page. The Logo Setup page appears: 
Click in the Choose new logo file text box and enter the name of the logo file you wish to use, or click the Browse... button and locate the desired file.
NOTE
You should use a GIF or a JPEG format file for your logo, preferably not larger than 100 kilobytes to minimize the download time. Plesk resizes the logo to fit in the banner area.
Click OK to place your logo in the banner area. This may take some time to upload.
You have the option to create a hyperlink that activates when a user clicks on your logo. The link may take the user to a corporate URL or other web site. Click in the Enter new logo link URL box. Type in the URL.
Click OK to activate the hyperlink.
If you change your mind and wish to revert to the Plesk logo, use the Default Logo button.