Microsoft announced the public availability of Microsoft Exchange Web Services (EWS) Java API 1.1, that offers the same functionality that EWS Managed API 1.1 for Microsoft .NET Framework offers.
"This API was developed in order to facilitate Exchange development on other platforms. It has been over a year in development, and it's the first release of a package that includes source code. Although the source is viewable, licensing for this iteration doesn't allow for modification of the source code. It can be used to build against a particular JRE or JDK, but the license agreement only allows the object code to be shared in your application. We took this approach because we're keeping the releases in sync with our Exchange versions. The 1.1 release corresponds to Exchange 2010 SP1," stated Microsoft.
Download: EWS Java API 1.1