Updated:
This will give you all the settings in the mobile policy. The encryption seems to only be addressable from CLI.
/opt/zimbra/bin/zmprov gc CoS| grep -i mobilepol
To disable the Encryption requirement.
zmprov mc CoS zimbraMobilePolicyDeviceEncryptionEnabled FALSE
Found the sync.log and this is what i get:
2011-12-14 16:17:14,102 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Provision;DeviceID=Moto99000054321234;Version=12.0;] sync - HTTP/1.1 500 Unexpected server error
2011-12-14 16:17:24,616 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Sync&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - POST Microsoft-Server-ActiveSync?Cmd=Sync&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551
2011-12-14 16:17:24,616 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Sync&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - DeviceID=Moto99000054321234; DeviceType=MotoDROIDBIONIC551; UA=Moto-DROID BIONIC/5.5.1; Protocol=12.0; PolicyKey=423670219
2011-12-14 16:17:24,617 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Sync&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Sync;DeviceID=Moto99000054321234;Version=12.0;] sync - HTTP/1.1 449 Retry after sending a PROVISION command
2011-12-14 16:17:25,233 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - POST Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551
2011-12-14 16:17:25,233 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - DeviceID=Moto99000054321234; DeviceType=MotoDROIDBIONIC551; UA=Moto-DROID BIONIC/5.5.1; Protocol=12.0; PolicyKey=null
2011-12-14 16:17:25,236 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Provision;DeviceID=Moto99000054321234;Version=12.0;] sync - Response size 128 bytes
2011-12-14 16:17:25,236 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Provision;DeviceID=Moto99000054321234;Version=12.0;] sync - HTTP/1.1 200 OK
2011-12-14 16:17:25,773 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - POST Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551
2011-12-14 16:17:25,774 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [] sync - DeviceID=Moto99000054321234; DeviceType=MotoDROIDBIONIC551; UA=Moto-DROID BIONIC/5.5.1; Protocol=12.0; PolicyKey=null
2011-12-14 16:17:25,775 WARN [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Provision;DeviceID=Moto99000054321234;Version=12.0;] sync - Unexpected server error
java.lang.NullPointerException
at com.zimbra.zimbrasync.commands.Provision.process(Provision.java:70)
at com.zimbra.zimbrasync.ZimbraSyncServlet.processCommand(ZimbraSyncServlet.java:549)
at com.zimbra.zimbrasync.ZimbraSyncServlet.processPostRequest(ZimbraSyncServlet.java:456)
at com.zimbra.zimbrasync.ZimbraSyncServlet.doPost(ZimbraSyncServlet.java:329)
at com.zimbra.zimbrasync.ZimbraSync$HttpHandler.doPost(ZimbraSync.java:55)
at com.zimbra.cs.extension.ExtensionDispatcherServlet.service(ExtensionDispatcherServlet.java:99)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:79)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:155)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:218)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:422)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.handle(RewriteHandler.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.DebugHandler.handle(DebugHandler.java:77)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:583)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:986)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:414)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:429)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
2011-12-14 16:17:25,776 INFO [btpool0-26://pluto.domain.com/Microsoft-Server-ActiveSync?Cmd=Provision&User=bbunny&DeviceId=Moto99000054321234&DeviceType=MotoDROIDBIONIC551] [name=
bbunny@domain.org;mid=6;Cmd=Provision;DeviceID=Moto99000054321234;Version=12.0;] sync - HTTP/1.1 500 Unexpected server error
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