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What you (should) have on your blackberry is a KEPUB, which is Kobo's super secret locked down ebook file format. For most ebooks Kobo also provides an Adobe ePub version which is what you want to import into Calibre.
Sign in to your Kobo account on their web site and select "My Library". You should see an "Adobe DRM EPUB" tab by each of your ebooks. Click on this to get the Adobe ePub. Note that you need Adobe Digital Editions on your PC or Mac, and you should register to get an Adobe ID before downloading an ebook. Under Linux, you can likely run ADE using Wine.
What Kobo sends you is an ACSM file that is a "ticket" that Adobe uses to get you the actual ePub. If you get an .acsm file, open it on Adobe Digital Editions and ADE will get the ePub. It has DRM, so see Apprentice Alf's Blog for what to do about this.
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