Yes, they do. You wouldn't believe how much. In our corporation we're talking about 3000+ decentral boxes where only some 15 boxes run Progress databases. Half of them ( round about 1500+ ) have already been exchanged ( here they say migrated because it might fool you into believing that that does not mean that you have to buy a new box ... ). Plus, there is a big bonus: Our Unix engineering decided that there are only two: Two files systems you can choose of: ZFS or the Oracle database file system. It's like having to choose between the lesser of two evils ...
Well, all this large scale decision are well beyond may pay grade ...
Heavy Regards, RealHeavyDude.