This notification is to let you know we published  a revised version of Exchange 2007 SP3 RU3 (v2).  

The Exchange Servicing team has fixed the reported issue with RU3 and is making available a new version of RU3 for our customers, which is version 08.03.159.002

RU3 Installation Guidance:

·        Customers with RU3 already installed within your Exchange environment

It is not necessary for you to uninstall the existing RU3 within your environment. The new RU3 package can be installed over the top of the existing package installed on your servers.

·        Customers with previous SP3 RU’s installed within your Exchange environment

You can simply install the new version of the RU3 package.

If this is not a performance issue due to:

• CPU issues on the CAS or Mailbox Servers

• Disk latencies on the Mailbox Server

Then consider the follwoing:- 

1) Update 5.0.2 Maintenance Release 4 of Blackberry Enterprise Server
2) Update MAPI/CDO on the BES servers to

Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1
http://www.microsoft.com/downloads/en/details.aspx?familyid=E17E7F31-079A-43A9-BFF2-0A110307611E&displaylang=en

3) Exchange 2010 SP1 RU3 on the CAS and Mailbox server.

Still having problems ? Consider trying BES script/program to promote MAPI properties (From RIM)

Update Rollup 3 for Exchange Server 2010 Service Pack 1

http://support.microsoft.com/kb/2492690

Update Rollup 3 for Exchange 2007 SP3

http://support.microsoft.com/kb/2492691