How to know user is using Yahoo Beta or Yahoo original

From: PHP Wooer <abhijeetGH@xxxxxxxxx>
Date: 31 May 2007 06:13:24 -0700

Is there any way using PHP to find out whether a user ie. (email Id
eg: mycodetest@xxxxxxxxx) is using Yahoo mail beta version or the
original one. Similarly for hotmail whether the user (email Id eg:
mycodetest@xxxxxxxxxxx)is using hotmail live or original hotmail.

.

Follow-Ups:
- Re: How to know user is using Yahoo Beta or Yahoo original
  - From: Schraalhans Keukenmeester

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