I downloaded latest DLL but still i got the same error.
Please check the log created.
2016-04-19 22:26:41.663 Opening log file.
2016-04-19 22:26:41.694 Using FileLogWriter version 2.0.5885.0.
2016-04-19 22:26:44.643 DEBUG Imap(1)[9] Info: State changed from 'Disconnected' to 'Connecting'.
2016-04-19 22:26:44.643 INFO Imap(1)[9] Info: Connecting to 10.242.47.95:110 using Imap 2.0.5885.0 (trial version).
2016-04-19 22:26:44.643 INFO Imap(1)[9] Info: Connecting to 10.242.47.95.
2016-04-19 22:26:46.249 DEBUG Imap(1)[9] Info: Connection succeeded.
2016-04-19 22:26:46.515 DEBUG Imap(1)[9] Info: State changed from 'Connecting' to 'Reading'.
2016-04-19 22:26:46.530 INFO Imap(1)[9] Response: +OK The Microsoft Exchange POP3 service is ready.
2016-04-19 22:26:46.577 DEBUG Imap(1)[9] Info: State changed from 'Reading' to 'Disconnected'.
2016-04-19 22:26:46.593 ERROR Imap(1)[9] Info: Rebex.Net.ImapException: Invalid IMAP response.
at Rebex.Net.Imap.UI(String N, PDW W, String B, Boolean A)
at Rebex.Net.Imap.WM(String N, Int32 W, TlsParameters B, SslMode A)