As I mentioned in an earlier post, Adobe objected to the use of the name TIFF in the TIFF/A Initiative and proposed TIFF profile. Since Adobe holds the trademark, their objection has legal force. Accordingly, TIFF/A has become TI/A (Tagged Image for Archival), and the Initiative is now using the domain ti-a.org. The old domain redirects to the new one.
This is bound to cause some confusion, but it looks as if there wasn’t any choice.