If it pleases me, I will answer you.
If it pleases another, they will answer you.
All of us are quite pleased.
It can mean, in a general sense, "if you WILL it". In fact, you can use "if you will" just as you can use "if you please".
Also, do not be put off by "archaic" expressions. All of English is credible for usage.
In the USA, the phrase "if you please" is quite common.
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