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I understand why they are using or not using EAS/POP3/IMAP/MAPI/OWA, but I'm not sure what they are doing that is using EWS. I can see quite a few users connecting via EWS some days.

Generally we use Outlook 2010/2013, EAS on iPhones etc, Blackberry with BES, OWA and Lync.

Any ideas what's using EWS?

My PowerShell command:

get-connectionbyclienttypedetailreport -StartDate 08/01/13 -enddate 08/31/13 | where "clienttype"-eq "ews"  | sort-object username
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The BES server will use Exchange Web Services (EWS), using impersonation to manage Blackberry calendars.

BES Office 365 PDF

By default, the BlackBerry Enterprise Server uses Microsoft Exchange Web Services to manage calendars on BlackBerry devices.

So, assuming the users you are referring to are indeed BB users, that would make sense.

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I guess that would explain why it's not all BB users. Only those who have made updates to their calendar from their BB device, I assume. Thanks. – finisterre Sep 4 '13 at 14:37
Just checking. I see some users who don't have Blackberry devices in the EWS list too! – finisterre Sep 4 '13 at 14:53
Who are the users in the PS results and what are they using to access Exchange online? Office for Mac uses EWS as well. – TheCleaner Sep 4 '13 at 14:58
Just a mixture of users. Yeah, I know about Office for Mac - but we don't have any of those either. It's odd. it's not causing me a problem - I'm just curious to know what is happening. Could it be anything to do with SharePoint Online? Lync? – finisterre Sep 4 '13 at 15:09
A Sharepoint site that uses an Exchange calendar probably uses EWS, but I haven't bothered to look. Lync uses it for presence info from the Exchange calendar of the user. So it's probably a combo of these things showing up in your PS results. I haven't watched this yet, but plan on doing so. It may even point out in detail your answer:… – TheCleaner Sep 4 '13 at 15:49

The only way to really get actionable information is to trawl IIS logs for connections to an on-premises Exchange server. Info on searching IIS logs. Unfortunately you get no such access in O365.

I can tell you that Lync definitely uses EWS, for things like calendar lookup and Presence updates.

I have yet to find a definitive list of Microsoft services that use EWS. I have recently reached out to some of the Microsoft Garage teams and they gave me the UserAgent ID for some apps. My own notes on the matter.

Microsoft Garage Send app: "MicrosoftSend/*"

Microsoft Garage Tossup app: "OutlookApps Tossup/Prod"

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