Most popular variants of the header value (we only show this when there's just a bunch of variants):

A non-standard header used by Microsoft SharePoint and Office applications to communicate the version of server platform. Since it contains a detailed version of the software, it probably shouldn't be advertised on the public Internet.

Reference...

We have seen 2229 websites setting the MicrosoftOfficeWebServer HTTP header and 4 unique values of this header.

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