Tomorrow, March 14, is 'Pi Day', an opportunity to celebrate all things mathematical. The date (3/14) corresponds to the first few digits of pi, and Microsoft will be joining in the festivities with some special themed promotions available in the US.
The most exciting deal will be available on the company's Xbox Music Pass, which offers unlimited music streaming from tens of millions of songs. You can also download music to listen offline, and access tunes from phones, PCs and on the web, as well as via Xbox consoles.
Ordinarily, an annual Music Pass would set you back just under $100 - but on Pi Day, Microsoft will be selling it for just $31.41. If you already have a Music Pass, you can still buy one at the discounted price; the additional twelve months will be added to the remainder of your subscription.
Alongside that offer, you can also grab the new Einstein Brain Trainer HD app - which has just launched on Windows Phone - right now for $1.49, a 50% discount on the usual price.
And for a bit of extra fun, Microsoft will be selling some 'special Pi Day-themed Digital Gift Cards', which you can personalize and send to friends and family. Be warned, though: these limited edition digital cards will only be on sale for a short time - as Microsoft says, perhaps as little as 3.14 days.
Happy Pi Day!