"Certain Pocket PC Models have SD or SDIO slots but are not compatible with the SDIO WLAN Card. These include: Toshiba e350 and e750 ? these have SDIO slots but do not have SDIO Now! software from BSQUARE. The e355 is the same as the e350.
Michael - eXpansys"

Just put the following words into http://www.google.com to learn the bitter truth.

Toshiba e355 WiFi

My advice? Ask for a refund/exchange.