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1. for those who are using blackberry, to ensure the blackberry works fine, what is the ideal mailbox sizes?
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Doesn't matter; a BB will only get the frist 2KB of a message and if it runs low / out of space it will purge old data.
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2. 8310 equipped with SD card. does the blackberry use the SD card for memory swapping (operating system + swapping mail) or its just for the camera + file storage only?
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Just for camera + file storage only. The OS doesn't use it to store data; even temporarily.
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3. sometimes the deleted mail in the blackberry is not deleted. the mail are still in the blackberry inbox. whats the problem and how to mitigate this problem?
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Check these out:
KB13814 - Messages on BlackBerry smartphone are deleted due to low memory
KB04853 - How to enable hard deletes
KB04863 - Permanent deletion of email messages in Microsoft Outlook does not reconcile to the BlackBerry smartphone