hi.
look at this post
community.dynamics.com/.../225383.aspx
Direct from Microsoft
"Exchange Online uses a federation trust which we still do not support in any of the current supported Dynamics NAV releases. The upcoming release Sicily / Dynamics NAV 2013 R2 still does not support Exchange Online. It is however on top of the features the product group would like to do in version next.
Regarding OnPrem release of Exchange 2013. Here is an answer regarding the initial request I filed a couple of weeks ago:
1. NAV 2013 and NAV 2013 R2 must support Exchange 2013 OnPrem. Even if it means that we will have to hotfix it.
Exchange online has not been a part of the NAV 2013 R2 scope and will not be supported initially, but it is on the top list for next version.
It is true that public folders which we need is now available, but the issue around AD needs some investigation
1. We also have a product bug for now logged on Sicily to address a defect with connecting to Exchange 2013 OnPrem. The fix for this defect should be ported down to NAV7HF"
- Marco Mels