So do electret mics have polarity? The following circuits seem to contradict each other...
Now the problem is one image shows polarity while the other one does not!! What's the holdup here?
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Yes, they have polarity and it has to be right to work- the output needs to be biased positive with respect to the ground terminal.
The ground/GND terminal should be common with the case, so you can check polarity with a multimeter.
Here, from a Panasonic Datasheet, is a typical arrangement:
The two diagrams you show are equivalent, one is just drawn upside-down (potentially.. as it were.. confusing and not to be encouraged, but still valid).