POP3 Error in Exchange

[davy2k]

Dear All,
I configured Outlook 2007 for a user to download his email from Exchange via POP3 but messages are stuck in Outlook and I saw the errors below in Event viewer.

An exception Microsoft.Exchange.Data.Storage.ConversionFailedException occurred while converting message Pop3Message 3723, user "r", subject: "Meeting With", date: "6/27/2008 1:44:49 PM" into MIME format. Microsoft.Exchange.Data.Storage.ConversionFailedException: Message content has become corrupted. ---> Microsoft.Exchange.Data.Storage.CorruptDataException: Invalid global object ID.
at Microsoft.Exchange.Data.Storage.GlobalObjectId.get_Uid()
at Microsoft.Exchange.Data.Storage.VEvent.DemoteUid(VEvent vevent)
--- End of inner exception stack trace ---
at Microsoft.Exchange.Data.Storage.VEvent.DemoteUid(VEvent vevent)
at Microsoft.Exchange.Data.Storage.VEvent.DemoteProperties()
at Microsoft.Exchange.Data.Storage.VEvent.Demote(Item item, ConversionAddressCache addressCache, CalendarWriter calendarWriter)
at Microsoft.Exchange.Data.Storage.VCalendar.DemoteVEvents()
at Microsoft.Exchange.Data.Storage.VCalendar.Demote(CalendarWriter calendarWriter)
at Microsoft.Exchange.Data.Storage.CalendarDocument.ItemToICal(Item item, OutboundAddressCache addressCache, Stream stream, String charsetName, OutboundConversionOptions outboundConversionOptions)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeBody(MimePartContentType contentType, MimeFlags flags)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.StaticWriteMimeBody(ItemToMimeConverter converter, MimePartInfo part, MimeFlags flags)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimeParts(List`1 parts, MimeFlags mimeFlags)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.WriteMimePart(MimePartInfo part, MimeFlags mimeFlags)
at Microsoft.Exchange.Data.Storage.ItemToMimeConverter.ConvertItemToMimeInternal(MimeStreamWriter writer, ConversionLimitsTracker limits, MimeFlags flags)
at Microsoft.Exchange.Data.Storage.ItemConversion.<>c__DisplayClassf.<InternalConvertItemToMime>b__e()
at Microsoft.Exchange.Data.Storage.ConvertUtils.CallCts(Trace tracer, String methodName, String exceptionString, CtsCall ctsCall)
at Microsoft.Exchange.Data.Storage.ItemConversion.ConvertItemToMime(Item itemIn, Stream mimeOut, OutboundConversionOptions options)
at Microsoft.Exchange.Pop3.Pop3Message.<>c__DisplayClass6.<GetMimeStream>b__1()


The user is getting really frustrated, please help.