BlackBerry announced the issues in postings on Facebook and Twitter on Friday, and said it fixed the troubles after a few hours. It apologized to customers for the inconvenience caused.
The outage brought up unpleasant memories of last year's troubles with emails and chat messages that left many users bereft for up to three days.
The timing could not have been worse, coming as lines formed outside of Apple stores in a number of cities as the new iPhone 5 went on sale.
RIM spokeswoman Amy Jones said the outage was limited to Europe, the Middle East and Africa. Jones did not have details on what caused it.
"It's the worst timing," Jefferies analyst Peter Misek said.
"This is bad publicity and it's very unfortunate. But frankly the attention is all going to be on Apple today, all the weekend and frankly until the end of the year. Frankly, it's kind of irrelevant. The only thing that's relevant is when they are going to come out with their new phones."
Mr Misek said he thinks the transition to the BlackBerry 10 software intended to run their new line of smartphones, could be a cause of the outage. RIM is preparing to launch the new phones early next year, after a series of delays.
"We think that switch over is causing the difficulties," Mr Misek said.
The latest outage comes as customers are abandoning their BlackBerrys for flashier iPhones and Android phones.
RIM was once Canada's most valuable company with a market value of more than USD 80 billion in June 2008, but the stock has plummeted since, from over USD 140 share to around USD 7.
Shares traded down 1.5 per cent, or 30 cents, to USD 6.80 in premarket trading on the Nasdaq. RIM's decline is evoking memories of Nortel, another Canadian tech giant, which declared bankruptcy in 2009.