2.1.871 Part 1 Section 18.17.5.4, Interpretation
a. The standard gives maximum value as 2^1023 - 1, minimum as - 2^1023 + 1.
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Office uses maximum 2^1024 – 2^971, minimum - 2^1024 + 2^971 and has smallest positive value of 2^-1022.
b. The standard does not specify behavior if the absolute value of the raw value is smaller than the smallest positive value in the value space.
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In Office, if the absolute value of the raw value is smaller than the smallest positive value in the value space, then a consuming application shall treat this as equivalent to 0.