This past Wednesday the devs over at the osTicket forums updated their forum software.
https://forum.osticket.com
The new forum software is pretty similar to the old but there are no more categories. The site uses tags to determine how posts are organized. You can add tags to your post when you create it.
Unfortunately they could not transfer your passwords. Please use the lost password link to get the site to send you a password reset link to get in.
source: https://forum.osticket.com/d/92995-forums-upgraded