[horde] ActiveSync Error with Android

[Jan-Philipp Hülshoff]

Hello everyone,
I'm currently trying to setup a horde groupware (Horde (horde) 5.1.5,  
Webmail (imp) 6.1.6) with ActiveSync to my Smartphone (Samsung Galaxy  
S2, Samsung Android 4.1.2). I got the following error in my IMAP  
Server (Apache James 3.0-beta4) when syncing mails:

INFO   | jvm 1    | 2013/12/02 11:41:37 | DEBUG 11:41:37,665 |  
james.imapserver | ID=603343729 Got <command>: UID
INFO   | jvm 1    | 2013/12/02 11:41:37 | DEBUG 11:41:37,665 |  
james.imapserver | ID=603343729 Cannot parse protocol
INFO   | jvm 1    | 2013/12/02 11:41:37 |  
org.apache.james.imap.decode.DecodingException: Expected end-of-line,  
found '('.
INFO   | jvm 1    | 2013/12/02 11:41:37 |       at  
org.apache.james.imap.decode.ImapRequestLineReader.eol(ImapRequestLineReader.java:131)
INFO   | jvm 1    | 2013/12/02 11:41:37 |       at  
org.apache.james.imap.decode.parser.FetchCommandParser.decode(FetchCommandParser.java:289)
INFO   | jvm 1    | 2013/12/02 11:41:37 |       at  
org.apache.james.imap.decode.parser.AbstractUidCommandParser.decode(AbstractUidCommandParser.java:42)
INFO   | jvm 1    | 2013/12/02 11:41:37 |       at  
org.apache.james.imap.decode.parser.FetchCommandParser.decode(FetchCommandParser.java:40)

So it seems that the server thinks that there was an illegal IMAP  
command. It could be the IMAP Server that does not implement a special  
command or it could be horde that does something weird.
The IMAP server works flawlessly with IMP and other mail clients.

Are there any possibilities to see the IMAP commands that are  
sent/generated by Horde?
Are the IMAP library of IMP and ActiveSync the same?
Does ActiveSync require special capabilities from the IMAP Server?

Kind regards,
   Jan-Philipp Hülshoff