Ek3 page not found on some emails

E2k running on win2k3

When accessing email via Ek3 OWA some emails display “The page cannot be Found”. I have seen all the postings about URLScan, but this machine does not have URLScan installed. One of the characters causing the problem is the “:” – in every subject line that is a reply or forward! This problem appeared “out-of-the-blue” one day last week after months of working great. No critical updates have been installed since 10/14 – No other software has been installed either.

As a Test I installed URLScan 2.5 and then uninstalled it – no change.

I know this problem is related to the URL – I did find other characters that would cuase the problem including the quote and the question mark and a coma.