Yahoo is forcing an upgrade to their current version of Yahoo Web Analytics tracking code (from version 4 to version 5). The deadline for upgrading is the end of this month. Here is the message within the interface:
In 2009, we migrated all of our client accounts to a new Data Center in order to improving the overall security and reliability of our service and come in line with the high standards of security and service demanded by Yahoo!. At that time, we introduced a new version of the Yahoo! Web Analytics tracking code (version 5). Please note that support for version 4 of the YWA tracking code will cease on July 30th 2010. Please visit our Help Center should you have any questions about using version 5 of the tracking code. Our Installation Guide for Version 5 may be downloaded from here
I have looked at the version 4 versus version 5 image requests and parameters sent to their servers and it's still the same server and parameters, so I don't really see why they need to enforce this.
Also, I talked to someone who said their Yahoo Account Manager said that Yahoo does not plan on actually enforcing this. Can anybody confirm this or know anything about this? I just found out about this and I'm afraid I'm not going to be able to upgrade my website's code in time (I have multiple websites with very complex implementation....)