While attempting to redeem the Express Upgrade for Windows Vista via the ModusLink program fulfillment website, your order may be rejected and you may see a message indicating that the Certificate of Authenticity (COA) is invalid, for example:

"We're sorry but we are unable to validate your COA Number."

"COA was previously validated at MS. Please check validity of the COA with Microsoft."

Microsoft Corporation has advised Toshiba that this problem happens with only a small number of COA numbers, and recommends that you provide the rejected COA number to the ModusLink support center at MSTUPVISTANA@moduslink.com.

Each COA may be used only once -- for one copy of Windows Vista.

See also Support Bulletin 98082236 Windows Vista downgrade rights (to Windows XP Professional).

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