Seesmic drops support for Blackberry, focussing on popular platforms like Windows Phone 7

In a note posted on their website Seesmic has announced that they will be dropping support for RIM’s embattled Blackberry platform.

They write:

Important update for Blackberry users

Blackberry users, we have important news we would like to share:

Effective June 30th, Seesmic will discontinue support for Blackberry in order to focus development efforts on our most popular mobile platforms: Android,iOS and Windows Phone 7.

We encourage those effected by this change to try out Seesmic for Android, iOS and Windows Phone 7, as well as Seesmic Desktop and Web.

Sincerely,

Team Seesmic

RIM, who lost half of its market capitalization over the last 6 months, and which is now worth less that $13.5 billion, is believed to have lost 18% of its US subscribers in the last year, and is one of the most fragmented platforms, with numerous versions of its operating system in circulation, making it one of the most complex and expensive platforms to support. 

The withdrawal of support by developers will be seen as another blow against the company, and will do nothing to halt the slide in the share price of the company, already down nearly 30% since last week.