Entourage is the oldest of these, with the Web Services Edition released in 2008 to allow connectivity to Exchange Server 2007 using EWS.
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There are two separate Mac clients that use Exchange Web Services for connecting to Exchange Online Entourage and Mac Outlook. These applications are controlled with different EWS settings which are discussed next. PS C:> Set-OrganizationConfig -EwsApplicationAccessPolicy EnforceAllowListĮnforcing a block or allow list for EWS has no impact on the Entourage, Outlook for Mac, or Microsoft Outlook applications. A more restrictive approach is to enforce an allow list instead, which requires that any EWS applications be listed in the allow list before they can connect. Enforcing a block list will permit any EWS application that is not in the block list to connect. If you only wanted to block it for a single mailbox user the same process would be used, but the Set-CASMailbox cmdlet would be used instead of Set-OrganizationConfig. The example above blocks LinkedIn EWS access for the entire organization. However there is no quarantine action available, only allow or block. Unlike ActiveSync device access rules the strings used for EWS block and allow lists can use wildcards for partial matches. PS C:> Set-OrganizationConfig -EwsBlockList C:> Get-OrganizationConfig | fl ewsblocklist Similarly, to remove an entry you would run this command.
For example, to also add the OWA for Devices user agent to the block list you would run this command. PS C:> Set-OrganizationConfig -EwsBlockList EWS block list is a multi-value attribute so it should be managed using add/remove methods to avoid overwriting existing values when you are making modifications. Next, add the LinkedIn user agent to the EWS block list. PS C:> Set-OrganizationConfig -EwsApplicationAccessPolicy EnforceBlockList First, set the EWSApplicationAccessPolicy to enforce the block list. The EWS application access policy can be configured on a per-mailbox basis, or configured for the entire organization.Ĭontinuing with the example of LinkedIn, to block EWS access by the LinkedIn user agent for the entire organization there are two steps required that use the Set-OrganizationConfig cmdlet. Fortunately, we can be selective in what we block or allow for EWS by configuring an EWS application access policy. The connection from LinkedIn made use of Exchange Web Services and highlighted the need to monitor and control EWS access to Exchange on-premises and Exchange Online.ĭisabling the entire EWS protocol because of one unapproved example of application access would deny your organization the many good things that EWS allows. LinkedIn would then connect to the person’s corporate email account and scrape it for email addresses to suggest them as potential contacts that should be invited to connect on LinkedIn. In June of 2013 LinkedIn was found to have implemented a feature that invited users to enter their corporate email credentials on the LinkedIn website. PS C:> Get-CASMailbox Alan.Reid | fl ews* EWS controls can be managed at the mailbox level or the organization level. In general it is a useful protocol, but as with any protocol used to access Exchange Online there are controls available for administrators to use for a variety of scenarios.
For example, an EWS application can retrieve information about calendar items for room mailboxes to determine which items might have an organizer who no longer works for the company.ĮWS is also used by Microsoft Outlook for calendar free/busy information, Out of Office settings, calendar sharing, and other features such as MailTips. Applications can use EWS to retrieve information from Exchange Online services, or to interact with data in Exchange Online mailboxes. In this excerpt from Office 365 for IT Pros we look at the controls that are available to you for managing Exchange Web Services.Įxchange Web Services (EWS) is an API that enables client applications to communicate with Exchange Online.
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