Q: What Exchange versions are supported by JEC/EWSJ?
A: JEC supports Exchange Server 2000, 2003 and 2007. EWSJ supports exchange 2007, 2010 and 2013. We recommend JEC for Exchange 2000 and 2003, and EWSJ for 2007, 2010 and 2013, 2016, 2019 and 365.

Q: How JEC is working, what protocol it uses, what its architecture?
A: JEC Uses WEBDAV/HTTP to communicate with exchange, which means that the Exchange server OWA (Outlook Web Access) need to be on.  regarding the Architecture, JEC uses ApacheHTTPClient and a modified version Jakarta  Slide to Support Microsoft WEBDAV Exchange API (which is not standard WEBDAV).

Q: How EWSJ is working, what protocol it uses, what its architecture?
A: EWSJ Uses EWS/HTTP to communicate with exchange,   regarding the Architecture, We developed all the Web Services layer from ground, not relaying on any Web Services library, which gives us much more flexibility when implementing Exchange operations and busting performance.

Q: Exactly what Exchange types are supported? 
A: Exchange Events are fully supported: Get, Add, Edit, Delete and Filter Contacts are fully supported.                                                                                       
Tasks are fully supported. 
Contacts Public folders are supported.                                                                    
i18n for all types are supported.                                                                                            Emails are supported, Get, with attachments, send with attachments is supported, save draft is supported.

Q: Does JEC/EWSJ Supports SSL? What authentication schemes are supported?
A: JEC and EWSJ supports SSL and also partially supports self signed certificates.  basic, digest, NTLM (Windows Integrated) and FBA authentication schemes are supported. NTLM v2 is also supported.  

Q: Where can I find the version content and release notes?
A: The version content and release notes are published in the JEC forum (its also available in the version download).