yes, you can withdraw the funds. They don't make it very easy to do however.
b. You can withdraw your Upromise contributions at any time during your membership in the Upromise Rewards Service. To withdraw company contributions from your Upromise account, submit a letter in writing to Upromise requesting a withdrawal from your Upromise account. The letter must state your full name and the exact amount that you would like to withdraw, up to total amount available in your account, pending contributions are not eligible for withdrawal.
For the protection of our members, we require a Signature Guarantee on all withdrawal requests in excess of $200. A Signature Guarantee is a guarantee you can obtain from a financial institution, such as your bank, that your signature is yours and that it is genuine. It is not the same as a notary, as a notary states that a document was signed in the presence of the Notary Public, it does not validate the signature itself. This Signature Guarantee should be placed next to your signature on the withdrawal letter.
Withdrawal letters should be sent to:
Upromise
ATTN: Customer Care
P.O. Box 55555
Boston,MA 02205-5555
Checks are sent once per calendar quarter, so you should typically receive your check within 12 weeks of your request being received.