YES, PositiveSSL certificates shipped by InterSSL are Microsoft approved because the certificate path resolves to "USERTrust RSA Certification Authority"!
The certificate path of PositiveSSL certificates is delivered as follows:
1. www.domain.xyz
2. Sectigo RSA Domain Validation Secure Server CA
3. USERTrust RSA Certification Authority
You can find the "USERTrust RSA Certification Authority" in the Microsoft list, so it is approved.
The "USERTrust RSA Certification Authority" certificate signs the intermediate certificate "Sectigo RSA Domain Validation Secure Server CA" from point 2 and this in turn signs the domain in point 1.
