Integrated windows authentication via EWS on Office 365.

Anyone know if there's a way to get my custom .net app to auto authenticate to office 365 mailboxes like it does with on premises exchange mailboxes? I use the current windows credentials in my app to authentication to the local exchange fine. However, in Office 365 I have to explicitly specify the users email and password. Is there a setting on offfice 365 that would allow this. I think it's also called Anonymous authentication...  

I tried with the EWSEditor test tool also and it's default windows credentials feature fails for office 365 also.

https://ewseditor.codeplex.com/

Any suggestions would be great!

May 13th, 2015 5:50pm

Anyone know if there's a way to get my custom .net app to auto authenticate to office 365 mailboxes like it does with on premises exchange mailboxes via EWS? I use the current windows credentials in my app to authentication to the local exchange fine. However, in Office 365 I have to explicitly specify the users email and password. Is there a setting on offfice 365 that would allow this. 

I tried with the EWSEditor test tool also and it's default windows credentials feature fails for office 365 also.

https://ewseditor.codeplex.com/

Any suggestions would be great!

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May 14th, 2015 11:55am
I'm assuming you're using EWS since you mentioned EWSEditor. You cannot use your Windows credentials, you must authenticate with Basic or OAuth.
May 14th, 2015 12:37pm
Yes, EWS.  Even if my AD is on premises I would still need to use OAuth?
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May 14th, 2015 2:46pm

Anyone know if there's a way to get my custom .net app to auto authenticate to office 365 mailboxes like it does with on premises exchange mailboxes via EWS? I use the current windows credentials in my app to authentication to the local exchange fine. However, in Office 365 I have to explicitly specify the users email and password. Is there a setting on offfice 365 that would allow this. 

I tried with the EWSEditor test tool also and it's default windows credentials feature fails for office 365 also.

https://ewseditor.codeplex.com/

Any suggestions would be great!

May 14th, 2015 3:53pm

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