2 clients of the BES are occasionally getting the following messages. Has anyone seen these before? I know in the past I have seen it once and the user noticed a calendar entry that didn't match up and that fixed it.

If this is the same thing how can I narrow down the messages/contacts/calendar entries that are causing the issues and how can I avoid this problem in the future?

************************************************** ****************
----- Original Message -----
From: besadmin <besadmin@boston-engineering.com>
To: Robert Treiber <rtreiber@boston-engineering.com>
Subject: Local Failure Notice

Local Failures were detected. No action is required.
This e-mail was generated for technical support purposes.

Sync Type: Delta Sync

Sync Token: 365973

Store: Zimbra - <Users Name>

Computer Name: BES

Version: 5.0.2688.16

Error IDs:
id (164710) type(message)
id (164711) type(message)
id (164712) type(message)
id (164713) type(message)
id (164714) type(message)
************************************************** ****************

There is also an attached sync.xml file that is sent with the message.
sync.xml
************************************************** ****************
<soap:Envelope>

<soap:Header>

<context>
<change acct="c53ca1e3-cb71-4550-b951-e614afc471ee" token="365973"/>
</context>
</soap:Header>

<soap:Body>

<SyncResponse md="1257505295" token="365973">
<m ms="365969" md="1257505288" l="111380" id="164710" rev="365969"/>
<m ms="365970" md="1257505289" l="111380" id="164711" rev="365970"/>
<m ms="365971" md="1257505289" l="111380" id="164712" rev="365971"/>
<m ms="365972" md="1257505289" l="111380" id="164713" rev="365972"/>
<m ms="365973" md="1257505289" l="111380" id="164714" rev="365973"/>
</SyncResponse>
</soap:Body>
</soap:Envelope>
************************************************** ****************

Reference to an older thread where people were having the similar problem:
Local Failure Notice Email