If M:\ is a network share, then M:\SomeFolder is a relative path because it doesn't include where M is mapped to.
If M on my computer is mapped to \\Server1\Folde r1 then the full UNC path is \\Server1\Folde r1\SomeFolder. It is unambiguous where the path is pointing to.
If M on your computer is mapped to \\Server2\Folde r2 then the full UNC path is \\Server2\Folde r2\SomeFolder.
This means that M:\SomeFolder can point to different locations for different users because M can be mapped differently. Using the full UNC path makes the location unambiguous.
If M on my computer is mapped to \\Server1\Folde r1 then the full UNC path is \\Server1\Folde r1\SomeFolder. It is unambiguous where the path is pointing to.
If M on your computer is mapped to \\Server2\Folde r2 then the full UNC path is \\Server2\Folde r2\SomeFolder.
This means that M:\SomeFolder can point to different locations for different users because M can be mapped differently. Using the full UNC path makes the location unambiguous.
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