Here is the error in sync.log

Code:

2008-02-25 14:29:17,244 INFO  [btpool0-1] [] sync - OPTIONS Microsoft-Server-ActiveSync?User=user@comany.com&DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61&DeviceType=SmartPhone
2008-02-25 14:29:17,248 INFO  [btpool0-1] [] sync - HTTP/1.1 401 Unauthorized
2008-02-25 14:29:17,538 INFO  [btpool0-1] [] sync - OPTIONS Microsoft-Server-ActiveSync?User=user@comany.com&DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61&DeviceType=SmartPhone
2008-02-25 14:29:17,546 INFO  [btpool0-1] [] sync - HTTP/1.1 200 OK
2008-02-25 14:29:20,172 INFO  [btpool0-1] [] sync - POST Microsoft-Server-ActiveSync?User=user@comany.com&DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61&DeviceType=SmartPhone&Cmd=FolderSync
2008-02-25 14:29:20,181 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=FolderSync;DeviceType=SmartPhone;] sync -
<?xml version="1.0" encoding="utf-8"?>
<FolderSync xmlns="FolderHierarchy">
    <SyncKey>{3C9CE7E4-122E-3B2F-B7C8-708AE045BA0C}9</SyncKey>
</FolderSync>

2008-02-25 14:29:20,186 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=FolderSync;DeviceType=SmartPhone;] sync - SyncState: last sync confirmed; version=9; modseq=8700; filter=0; cutoff=-1; clientsize=85/85
2008-02-25 14:29:20,186 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=FolderSync;DeviceType=SmartPhone;] sync -
<?xml version="1.0" encoding="utf-8"?>
<FolderSync xmlns="FolderHierarchy">
    <Status>1</Status>
    <SyncKey>{3C9CE7E4-122E-3B2F-B7C8-708AE045BA0C}9</SyncKey>
    <Changes>
        <Count>0</Count>
    </Changes>
</FolderSync>

2008-02-25 14:29:20,187 INFO  [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=FolderSync;DeviceType=SmartPhone;] sync - HTTP/1.1 200 OK
2008-02-25 14:29:21,221 INFO  [btpool0-1] [] sync - POST Microsoft-Server-ActiveSync?User=user@comany.com&DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61&DeviceType=SmartPhone&Cmd=GetItemEstimate
2008-02-25 14:29:21,230 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync -
<?xml version="1.0" encoding="utf-8"?>
<GetItemEstimate xmlns="GetItemEstimate">
    <Collections>
        <Collection>
            <Class>Contacts</Class>
            <CollectionId>7</CollectionId>
            <AirSync:FilterType>0</AirSync:FilterType>
            <AirSync:SyncKey>{DF7C0727-5324-3778-AF97-0286506D222B}5</AirSync:SyncKey>
        </Collection>
        <Collection>
            <Class>Calendar</Class>
            <CollectionId>10</CollectionId>
            <AirSync:FilterType>4</AirSync:FilterType>
            <AirSync:SyncKey>{AFEA66BD-B973-3E6C-9FB7-A075F240955D}31</AirSync:SyncKey>
        </Collection>
        <Collection>
            <Class>Email</Class>
            <CollectionId>2</CollectionId>
            <AirSync:FilterType>2</AirSync:FilterType>
            <AirSync:SyncKey>{11B4120D-057A-355B-A9B0-BF1E183F91EC}44</AirSync:SyncKey>
        </Collection>
        <Collection>
            <Class>Email</Class>
            <CollectionId>2600</CollectionId>
            <AirSync:FilterType>2</AirSync:FilterType>
            <AirSync:SyncKey>{DE2BB1E2-12CD-356D-86B1-B2A555381E4D}1</AirSync:SyncKey>
        </Collection>
        <Collection>
            <Class>Tasks</Class>
            <CollectionId>15</CollectionId>
            <AirSync:FilterType>0</AirSync:FilterType>
            <AirSync:SyncKey>{5FF21ADD-499D-31BE-8CE9-209A6FE5BF92}1</AirSync:SyncKey>
        </Collection>
    </Collections>
</GetItemEstimate>

2008-02-25 14:29:21,232 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync - SyncState: last sync confirmed; version=5; modseq=8485; filter=0; cutoff=0; clientsize=112/112
2008-02-25 14:29:21,237 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync - SyncState: last sync confirmed; version=31; modseq=8725; filter=4; cutoff=1202254493180; clientsize=55/55
2008-02-25 14:29:21,241 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync - SyncState: last sync confirmed; version=44; modseq=6635; filter=2; cutoff=1203206726123; clientsize=9/9
2008-02-25 14:29:21,276 DEBUG [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync -
<?xml version="1.0" encoding="utf-8"?>
<GetItemEstimate xmlns="GetItemEstimate">
    <Response>
        <Status>1</Status>
        <Collection>
            <Class>Contacts</Class>
            <CollectionId>7</CollectionId>
            <Estimate>0</Estimate>
        </Collection>
    </Response>
    <Response>
        <Status>1</Status>
        <Collection>
            <Class>Calendar</Class>
            <CollectionId>10</CollectionId>
            <Estimate>0</Estimate>
        </Collection>
    </Response>
    <Response>
        <Status>1</Status>
        <Collection>
            <Class>Email</Class>
            <CollectionId>2</CollectionId>
            <Estimate>20</Estimate>
        </Collection>
    </Response>
    <Response>
        <Status>1</Status>
        <Collection>
            <Class>Email</Class>
            <CollectionId>2600</CollectionId>
            <Estimate>1</Estimate>
        </Collection>
    </Response>
    <Response>
        <Status>1</Status>
        <Collection>
            <Class>Tasks</Class>
            <CollectionId>15</CollectionId>
            <Estimate>0</Estimate>
        </Collection>
    </Response>
</GetItemEstimate>

2008-02-25 14:29:21,276 INFO  [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=GetItemEstimate;DeviceType=SmartPhone;] sync - HTTP/1.1 200 OK
2008-02-25 14:29:21,732 INFO  [btpool0-1] [] sync - POST Microsoft-Server-ActiveSync?User=user@comany.com&DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61&DeviceType=SmartPhone&Cmd=MoveItems
2008-02-25 14:29:21,741 WARN  [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=MoveItems;DeviceType=SmartPhone;] sync -
000000:  03 01 6A 00 00 05 45 46 47 03 33 31 35 38 00 01  48 03 36 00 01 49 03 7B 31 38 35 44 34 32 35 37
000020:  2D 30 34 45 45 2D 34 35 43 45 2D 42 41 35 34 2D  33 31 44 41 31 38 34 36 39 30 35 30 7D 00 01*01
000040:  01
2008-02-25 14:29:21,741 WARN  [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=MoveItems;DeviceType=SmartPhone;] sync - General ZimbraSync exception
com.zimbra.zimbrasync.ZimbraSyncException: java.lang.NumberFormatException: For input string: "{185D4257-04EE-45CE-BA54-31DA18469050}"
        at com.zimbra.zimbrasync.ZimbraSyncServlet.parseRequest(ZimbraSyncServlet.java:425)
        at com.zimbra.zimbrasync.ZimbraSyncServlet.processCommand(ZimbraSyncServlet.java:397)
        at com.zimbra.zimbrasync.ZimbraSyncServlet.processPostRequest(ZimbraSyncServlet.java:328)
        at com.zimbra.zimbrasync.ZimbraSyncServlet.doPost(ZimbraSyncServlet.java:230)
        at com.zimbra.zimbrasync.ZimbraSync$HttpHandler.doPost(ZimbraSync.java:33)
        at com.zimbra.cs.extension.ExtensionDispatcherServlet.service(ExtensionDispatcherServlet.java:101)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
        at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
        at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:148)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:716)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:406)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.handler.RewriteHandler.handle(RewriteHandler.java:176)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
Caused by: java.lang.NumberFormatException: For input string: "{185D4257-04EE-45CE-BA54-31DA18469050}"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Integer.parseInt(Integer.java:447)
        at java.lang.Integer.parseInt(Integer.java:497)
        at com.zimbra.zimbrasync.wbxml.BinaryParser.nextIntegerContent(BinaryParser.java:107)
        at com.zimbra.zimbrasync.wbxml.BinaryParser.nextIntegerElement(BinaryParser.java:159)
        at com.zimbra.zimbrasync.commands.MoveItems.parseRequest(MoveItems.java:65)
        at com.zimbra.zimbrasync.ZimbraSyncServlet.parseRequest(ZimbraSyncServlet.java:421)
        ... 29 more
2008-02-25 14:29:21,741 INFO  [btpool0-1] [name=user@comany.com;mid=126;DeviceId=D09BD77F2C7D4852BC795FF2DCFEDB61;SyncCmd=MoveItems;DeviceType=SmartPhone;] sync - HTTP/1.1 500