I've heard of people using some phones that were even 2 years old that successfully worked with an 64GB SDXC card, however they said you have to re-format the card once it is in the phone since SDXC uses I think exFAT as the default filesystem and the phone needs it to be FAT32.
Your computer won't care because it is FAT32, but Windows will not let you format a drive beyond 32GB unless it is NTFS (which will not work with the phone) or exFAT.
This is strictly a microsoft designed limitation and does not apply to Apple or Linux.
Windows is perfectly happy with even a 500GB fat32 drive, it just won't let you make one.
Known as Stonent on XDA