Microarranger is same as PA50

http://korg.com/microarranger

page 131 of the manual says it can read PA 50, 60, & 80 styles

http://korg.com/uploads/Support/microARRANGER_OM_E1_634617865952010000.pdf

additional free styles are at http://www.korgpa.com/en/support/bonusware.html

With EMC Works 2000, you can convert styles from the most popular formats from Generalmusic, Kawai, Roland, Solton/Ketron, Technics, Yamaha, Wersi. Free copy is at http://korgpa.com/pa_root/software/bonusware/emc/styleworks2k_korgpa.zip

good luck

Duane