There is a big debate on this, but even if you read the comments, there are at least 4 reasons that English grammar would decide that Mic is the correct abbreviation.
- mike consists of letters not in the original word
- All spelling books in the country have the word spelled as "Mic", most with it being under the harder label for extra learning. The board of education strongly suggests that this be the more used variation.
- mike cannot be capitalized at risk of being mistake as the proper noun/name
- Abbreviations to nouns do not need to be conjugated
- If nouns are conjugated, and end in "-C", a "-K" is always appended. Examples below:
Magicked, Picnicking, mimicked, mimicker, frolicking, garlicky, havocked, panicked, plasticky, etc.
The Grammarist website has been accused of being incorrect many times.