If you still have a Drupal 6 site and use the 'update' module, you probably noticed that you're no longer getting accurate information about security updates on the "Available updates" report. In fact, it's telling you to disable all your modules, which isn't very helpful. :-)
This is because after February 24th, Drupal 6's End-of-Life date, all Drupal 6 modules on Drupal.org were marked as unsupported. This was always part of the plan, because the Drupal community wants to stop supporting Drupal 6, and leave that work to the Drupal 6 Long-Term Support (LTS) vendors.
However, it had an interesting side-effect!
If a module is marked as unsupported, the 'update' module won't tell you about available security updates for that module!
This is particularly problematic because there were 2 big security releases on February 24th as well: Drupal 6.38 and FileField 3.14. If you didn't update right away on February 24th, then on February 25th, there was already no mention of those security releases on the "Available updates" report. (Those two in particular are temporarily marked as supported, so you should actually see them now.)
And if you only do security updates every few weeks or months, then you could be unaware of even more security releases made before the update status information become unreliable.
(Note: While it's NOT recommended to wait that long, the reality is that people with small budgets can only pay someone to perform updates once a month, or every few months. We apply security updates same day for our customers, but not everyone can afford that.)
However, we've created an alternative to the 'update' module which will allow you to get accurate information about security updates, both past, and going into the future with releases from the Drupal 6 LTS vendors!