(COS) Class of Services

A COS establishes defaults for a variety of settings and decides which things and how they may be accessed by a web client. From the Settings page on the web client, a user who is a member of that COS can subsequently modify some of these settings.

Click the CREATE NEW COS button and give your COS a name. The choices may then be configured using the menu on the left.

Features are controls that let or block users from accessing the most popular parts of Carbonio CE through browsers and mobile apps. Some of them may be activated or disabled using the CLI; for details, see the section Setting Features through the CLI.


For each component (Mails, Calendar, and Contacts), preferences include standard choices.

The first is the language that COS members will automatically use, which also includes the location. The remaining options control how Carbonio CE appears in web clients (such as whether emails are displayed as conversations or whether the calendar displays a month or a work week) and how certain tasks are performed by the user, such as whether new email contacts are automatically added to Contacts or how frequently to check for new emails.

Server Groups

On this page, you can choose which servers new COS users can be added to.


The Advanced Option lets you customise things like user quotas, passwords, and rules.

A user’s space on the server or the number of contacts he can have are both restricted by the user quota, which is a set of settings. It has the choice to send recurring alerts when the user space rises over a predetermined level.

The user passwords’ length, character count, and duration may be customised using the password settings. Additionally, you can reject often used passwords.

The Carbonio CE behaviour when a user fails to log in can be defined using the Failed Login Policy. When three consecutive login attempts fail within 30 minutes, a normal policy can lock out the user for an hour.

The token’s validity period is covered by the timeout policy.

How long emails will be kept before being automatically erased is outlined in the email retention policy.

Finally, when utilising an Exchange server, the Free/Busy Interop option enables the provision of O and OU records to display the free/busy user schedule.

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