Source: The Detroit News
http://www.detnews.com/apps/pbcs.dll/article?AID=/20090306/LIFESTYLE04/903060356/1041/LIFESTYLE04
As Muslims commemorate the birth of the prophet Muhammad beginning Saturday at dusk, some say that remembering the events of the prophet's life and the guidance revealed by the Quran are especially important this year, after some pointed attacks on the reputation of the man they believe to be God's messenger and the perfect human being.
Mawlid An-Nabi, the prophet's birthday, is remembered by Sunni Muslims on the 12th day of the third lunar month, and by the Shi'a on the 17th day.
In Metro Detroit, many Sunnis will mark it Saturday, and many Shi'a during the following week or next weekend. He was born in about 570.