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Client access to Exchange Server 2013 is licensed with two different Client Access Licenses (CALs), a Standard CAL (SCAL) and an Enterprise CAL (ECAL). The SCAL is always required and the ECAL is additive, meaning accessing the full Exchange Server 2013 feature set requires the ECAL in addition to the SCAL. Both types of CALs can be purchased for each user or for each accessing device (typically a PC). Exchange CALs are commonly purchased as part of the Core CAL Suite and Enterprise CAL Suite and are often bought organization-wide in Enterprise Agreements, but they can also be purchased stand-alone.

The SCAL (pictured at the bottom) licenses Exchange's basic features, including the following:

  • Sending and receiving e-mail and storing e-mails in a personal mailbox, and scheduling appointments and meetings and maintaining a personal calendar
  • Storing a contacts database with e-mail and physical addresses, phone numbers, and other personal information; scheduling tasks and tracking their completion
  • Browser-based access (via Outlook Web App) to e-mail, calendar, contacts, and tasks
  • Built-in malware and spam filtering features of the Exchange software remove viruses, spyware, and unwanted messages from mail in transit
  • Basic mobile device management, which enables mobile device access to Exchange via the Exchange ActiveSync protocol and covers synchronizing data with mobile devices and enforcing basic administrative policies such as minimum mobile device password length
  • Basic journaling (sometimes called Per Database Journaling), which archives all messages sent to and from a group of mailboxes
  • Basic retention policies (sometimes called Default Retention Policies), which control how long messages in default folders are retained and what the system should do when a message reaches its retention age
  • In-place eDiscovery, which extends the Multi-Mailbox Search of earlier versions and allows authorized personnel (such as legal and compliance officers) to perform organization-wide searches on e-mail, calendar, task, and contact items
  • Site mailboxes, a feature new to Exchange Server 2013 (and SharePoint 2013) that makes it possible for team members to access a SharePoint site's documents as well as associated e-mail messages through a single user interface.

The ECAL (pictured at the top) supplements the features delivered by the SCAL with the right to use additional capabilities, many designed to improve an organization's ability to comply with legal obligations and government regulations, including the following:

  • Premium-level mobile device management, which enables more extensive policy enforcement via Exchange ActiveSync, such as the ability to prevent a mobile phone from being used as a modem for a PC
  • Premium journaling (sometimes called Per User/Distribution List Journaling), which offers more granular control, and therefore potentially smaller journals, by limiting journaling to e-mail sent to or from specific users or groups
  • Premium retention policies (sometimes called Custom Retention Policies), which allows retention policy to be set on nondefault folders (for example, folders that users create) and can allow users to specify a retention policy for individual messages that takes precedence over retention parameters set by the system administrator
  • Voice mail with unified messaging, which converts voice mail to text (giving users a readable preview of the caller's message), places the voice-mail audio and text into the same inbox as e-mail and faxes, and provides access to the unified inbox from a standard telephone using voice commands
  • Exchange Online Protection, a Microsoft-hosted service that filters e-mail going into or out of organizations for malware and spam and is available at no added cost to organizations that maintain Software Assurance coverage on the Exchange Enterprise CAL
  • In-Place Hold (previously called Legal Hold or Litigation Hold), which allows authorized personnel to override all other information retention policies (either indefinitely or for a set period of time) and ensure that messages already stored in specified mailboxes will be preserved and that all subsequent incoming and outgoing messages will be retained
  • In-Place Archive (previously called Personal Archive), which provides organizations with a server-based e-mail archival option, that, unlike Outlook personal store (PST) files, can be reliably backed up by administrators, retained per corporate policy, and searched when necessary
  • Automatic Message Protection, which enables administrators to define rules that protect messages and attachments without user intervention using Windows Rights Management Services (each client that sends or receives protected messages must also be licensed with a Windows Rights Management Services CAL)
  • Data Loss Prevention, which analyzes message contents for sensitive information, such as personally identifiable information, and allows administrators to configure policies to filter messages or monitor the results.