Number of PMs

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Is it possible to get more memory for PMs on the forum account? I constantly have to delete PMs and I would like to keep more than 100. Compared to other forums the number seems to be very low.

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bump.

I now have 120 (does it go up with time?).
It would be easier for me to help people who PM me if I could refer to old PMs. Is there a way to up PM space to let's say 1000 or 10000?