microsoft.com text =
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closed as too localized by Dan, RobM, Tom O'Connor♦, Greg Askew, EEAA Jun 18 '12 at 19:24
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It looks like an Exchange federation "proof record". More information here: http://www.expta.com/2011/07/how-to-configure-exchange-2010-sp1.html
MS documentation: http://technet.microsoft.com/en-us/library/dd335047.aspx
Anyway, we can use TXT records for anything, or at least that's what I understand reading "The semantics of the text depends on the domain where it is found." (RFC 1035)
In fact, there are several TXT records. If you run
So there is standart SPF record available while an additional header that may have custom purpose e.g. anything the developers/domain managers wanted.