Good news for Austrian, you can view your legacy MMS via http://mmsabruf.t-mobile.at
Quoted from Wikipedia:
T-Mobile Austria is an Austrian mobile communications company and 100 percent subsidiary of the German T-Mobile International AG & Co. KG. Originally named the company max.mobil. And after the complete takeover by T-Mobile in 2000 finally adopted on 18th April 2002 in T-Mobile Austria renamed.
T-Mobile Austria is the one according to customer numbers, second largest mobile provider in Austria and sells GSM – EDGE –UMTS – and HSDPA – and wireless services under the brands T-Mobile and tele.ring, with two brands, both post — as well asprepaid services are offered. Value of T-Mobile hot “Klax” (taken from the earlier “klax.max”), which tele.ring “Twist” and “mosquito”.