• Users who bought MuLab 3 UL on/after 12 March 2010 get a free upgrade to MuLab 4 UL, as promised!
• Users who received a free MuLab 2 -> 3 UL upgrade now also receive a free MuLab 4 XT.
• All MuLab XT users can profit from the XT -> UL Upgrade.
• Until 19 February, when purchasing a MuLab 4 UL User License (directly or via an XT -> UL upgrade), you also get a free upgrade ticket for MuLab 5 UL!

Or in a graphic scheme: