Steven,
Did you find the document that states this?
TIP: The end of support for Tivoli Storage Manager 5.5 and 6.1 has been
announced as April 30, 2014.
However, Tivoli Storage Manager for Mail 6.1 was not included in that
announcement.
As such, support for Tivoli Storage Manager for Mail 6.1: Data Protection
for Lotus Domino 5.5.x continues beyond that date.

Therefore, after April 30, 2014, you can continue to use Tivoli Storage
Manager for Mail 6.1: Data Protection for Lotus Domino 5.5.x by updating
the Tivoli Storage Manager Backup-Archive Client and API to version 6.2 .

http://www-01.ibm.com/support/docview.wss?uid=swg21509001
Frank Ramke