I think it varies even for versions of OS 5.x
My Treo 650 can only read up to 2gig. My 700p can use "many/most" 4gig SD cards, but to get to 4gb you need to be FAT32 compatible.
There is a document with some devices listed on it on the Palm support site, but it takes a little searching to find it. I've referred to it also at PI or PA or 1src, so you might be able to search at those sites.
Dont' know about the Win Mobile side of things.
Oh.. and even if you cant see 4gig, you might be able to see 2gig of it. Not sure.
Let us know how it goes. Good luck!
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