UBB.threads PHP Forum Software Community Forums Resources and Customizing Style Packs UBBT77 Styles settings question

Isaac, I need to ask one other styles question

I used to have all styles enabled from UBBT70-UBBT77

I have now disabled all styles except the two UBBT77 options.

I see that members can now only change to these two options.

HOWEVER how about all members that have chosen the other styles they still use their old style.

I know I can delete the old UBBT70-76 styles what happen when I do it?
Will these members who used UBBT70-76 automatically have there style set to default or do I need to execute a SQL command?

Thanks in advance for your answer.

PS
The reason for above question is that I will try and incorporate the forum layout in the rest of my website with new navigation bar that will look like UBBT77.
So all the other colors styles will not work