CrackBerry addicts may likely be experiencing withdrawal symptoms this evening.

Research in Motion's (RIM) BlackBerry smartphones experienced a "critical severity outage" Monday, according to RIM.

"This is an emergency notification regarding the current BlackBerry Infrastructure outage," RIM support account manager Bryan Simpson said in an e-mail. The message said the outage affected enterprise clients and "users of the Americas network."

BlackBerries went dark at least three times last year, in April, August, and December.