The issue seems to have hit enterprise customers and consumers alike. RIM confirmed that some customers in Europe, the Middle East and Africa (EMEA) had experienced difficulties, which means the problem spanned three continents.
As established in the first paragraph, BlackBerry's market share has been falling at the expense of the rather trendier Apple and the more flexible Google Android platform. Arguably, although it's still the natural choice of corporate emailers and (I find oddly but what do I know) the more youthful customer, there has never been a better time to look at the alternatives.
RIM has of course been working frantically to resolve the problem, and this could have happened to anyone. Its servers in Slough are being subjected to upgrades even now. What's going to do a lot of damage, though, is the confidence issue.
Except now people know they may not be. If the reliability is gone then so is much of the appeal. One more outage and I can imagine customers deserting the organisation in large numbers.