Blackberry users across Europe, the Middle East and Africa (EMEA) have been left unable to access e-mail or use the Blackberry instant messaging service following an outage.
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Blackberry-maker Research in Motion (RIM) confirmed customers across EMEA are experiencing issues using its services.
RIM was unable to confirm which Blackberry services were affected, saying "it's not the same for all customers".
A spokesman from RIM UK confirmed, "We are working to resolve an issue currently impacting some BlackBerry subscribers in EMEA. We're investigating, and we apologise to our customers for any inconvenience caused while this is resolved."
Social networking platform Twitter was flooded with complaints that Blackberry Messenger (BBM) was down, along with e-mail services and some applications, such as Twitter for Blackberry.
A report by the BBC suggested problems started at around 11am after a server crashed at a RIM datacentre based in Slough.
The services outage adds to a rocky patch for the smartphone maker in face of falling share prices, delayed products and loss of marketshare. In September 2011, RIM missed second-quarter earnings targets due to lower demand for older smartphone models.
Merchant bank Jaguar Financial, which has investments in RIM, has even called for the firm to put itself up for sale.