Cellphones are not synchronizing with Exchange 2003 server

I have an Exchange 2003 sp2 server that has been configured to
synchronize with our cellphones.  The direct push sync has been
working for almost 2 years, but has recently stopped synchronizing
changes to messages.  The phones receive all new email messages and
will send messages, but if you read the message or delete it on the
phone it will not synchronize the change in Outlook.  I have verified
that the phones and server both are still configured correctly, yet
have been unable to determine why this issue is occurring.

Thanks for your help.

Sidney

Check your IIS Logging for addtional info.

Check your IIS Logging for addtional info.  In addition, anything changed
between your Exchange Server and the internet such as Gateway device?

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner