Getting a 401 with EWS? Read this before opening a support case!

If your getting a 401 with an API going against Exchange or basically anything then the issue is most likely with your credentials and NOT your code. Instead of jumping to the step of opening a support case do the following: Recheck your login information. Check the user id used, password and domain information. Logins…

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EWS and Federated Authentication

Many are joining enjoying the benefits of federated authentication with OWA. However, with EWS they find that they cannot use federated authentication. EWS can use Basic, NTLM and oAuth for authentication.  EWS does not support things like SAML tokens, etc.  There is also no developer support for changing authentication token credentials programmatically – such as…

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EWS calls can do impersonation and delegation… how about REST?

This is an area where what EWS can do some things the REST API can do.  At this time the REST API does not support impersonation, delegation or Basic Authentication with Exchange.  Its possible that this may change in the future; however, for now those are not supported.  If you need those capabilities then look…

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WebDAV FBA Authentication Sample Explained.

 Here is some basic information on how FBA authentication is done with WebDAV.  To provide some insight into how this works, you should look at the sample code of KB891748 and review it with the explanation below.  Note that if you are going against Exchange 2007, you should reconsider using FBA authentication since FBA authentication…

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WebDAV and OWA Authentication Settings

With any login issue, it’s important to know which authentication protocols are valid.  You  have to code to an authentication protocol which can be used.   The authentication settings for OWA and WebDAV are tied together under Exchange 2000 and 2003.  Because of this, developers run into issues with WebDAV not being able to authenticate…

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How WebDAV – Use Basic Authentication with WebDAV even when FBA is enabled.

Some customers (developers) wish to use Basic Authentication when Forms Based Authentication (FBA) is enabled for Outlook Web Access (OWA). If OWA’s FBA is enabled, all WebDAV access needs to be FBA authenticated – which means significant changes need to be done to the code – not to mention the testing. The changes and testing…

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Welcome to WebDAV 101

Welcome to WebDAV 101.  Here you will find information on WebDAV and other Messaging APIS which you might not find elsewhere.   WebDAV 101 Training/White Paper: Attached is a document which provides a good introduction to WebDav for Exchange.  It’s bascily a white paper or training paper on WebDAV for Exchange.  You will find information on the…

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