With great fear of it being not supported I bought a SanDisk Ultra 64GB Micro SDXC card to use in my Samsung Ativ Smart PC Pro, the main reason being I was all too familiar when the shift from SD to SDHC and having to worry if the card can be read in the slot or not.
According to it’s Wikipedia entry, guess I shouldn’t have been that worried.
Basically, an SDXC card is the same as an SDHC card just that it has a capacity limit of 2TB. The issue of compatibility is more on the software side, as SDXC cards are formatted to the exFAT file system by default. Most modern Operating Systems would have support for this format.
The other bullet point is of course, in your typical SDHC slot the maximum read/write speeds of an SDXC card cannot be achieved.
All in all, it’ll work fine in Windows, maybe not up to full speeds depending on the reader card slot but you’ll still be able to use it.