It may make sense to double check each of your findings already also. I mention that as you have said that Series 40 Nokia's only keep logs for 30 days. The 6230 is a Series 40 handset and it keeps it logs until the end of time, there is no expiration time. A lot of newer Series 40's behave the same, in fact I don't think I've ever seen a series 40 where data expires.
Symbian devices on the other hand only keep logs for a maximum of 30 days. But you can of course subvert that process if you know what you are doing.
I am intrigued by the suggestion of deleted messages in MS_Del.dat too and wonder if you have any further information. I know a number of people who have researched that file and found that it contains status (delivery) reports only including sent and delivered dates/times with numbers etc..
Thanks
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