Microsoft claims EWS is legacy and should be disabled for security reasons.Ģ.
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Assuming you are using the most up-to-date software provided by Microsoft, the expectation is that thick clients such as Outlook and Skype should continue to work when using MFA.ġ. The organizational expectation when an organization turns on MFA for hosted email is that all avenues of access to that hosted email will be controlled by MFA or else require an explicit opt-out.ģ. The Organizational expectation is that third party identity providers are supported fully.Ģ. Microsoft claims support for third party identity providers. Learn more about managing client access to Exchange Online in Office 365 for IT Pros.Įxchange Server EWS, Exchange Online, Exchange Web Services, Office 365ġ. In addition, an ecosystem of “cloud backup” products is starting to grow, using EWS as the access protocol for backing up mailbox items from Exchange Online to cloud storage, meeting the needs of many organizations who would like to make use of Office 365 but are concerned about backup and recovery. EWS applications can send and receive email messages, manage calendar items, and a whole lot more.ĮWS is also used by many third party migration tools as the protocol for accessing Exchange Online mailboxes. It is also the API used for integration between Exchange Online and other Microsoft services such as Skype for Business and SharePoint Online. Reid - EwsAllowEntourage $ false - EwsAllowMacOutlook $ falseĮxchange Web Services is used by many organizations for custom application development, such as creating integrations between Exchange Online and their in-house line of business applications. For example, to block both Mac clients for a mailbox user you would run the following command. The Mac clients are allowed by default and can be blocked using Set-CASMailbox or Set-OrganizationConfig. For example, an enterprise that permits BYOD may choose to block Entourage and Mac Outlook and require those users to instead make use of Outlook Web App or Outlook delivered using an application virtualization infrastructure. The use of Apple Mac computers is common in many corporate and education sectors, however some organizations will have reasons to block the use of Mac email clients.
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Mac Outlook is the version of Outlook that ships with Office for Mac 2011, but also refers to the newer version of Mac Outlook that is currently in Public Preview and due for release with Office 2016 for Mac. Prior to that Entourage used WebDAV, which was deprecated in Exchange Server 2007 and removed entirely starting with Exchange Server 2010. Entourage is the oldest of these, with the Web Services Edition released in 2008 to allow connectivity to Exchange Server 2007 using EWS. 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. 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.
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