One of our clients was receiving a lot of 500 errors (5** errors are a variety of server errors) in their log files so we included an error trap so we would receive an email each time one occurred. Originally, it was setup because their XML file feeding their career search kept breaking and because it was coming from a third-party, we needed the heads-up. Now that that is fixed, we started getting some new ones.

These server errors were all happening on pages like this “/instmsg/aliases/*” where the asterisk was someone’s email alias. Turns out that when Microsoft Exchange opens an email sent by this site, it automatically looks to see if there is an instant messenger (IM) alias tied to the email address that sent it. Since Exchange isn’t on this server and there is no IM tied to the email address anyway, it resulted in an error. Thanks Microsoft.

No harm, no foul, but here are the details if you are interested: http://www.linkedin.com/answers/technology/information-technology/computers-software/TCH_ITS_CMP/164342-6857609