Welcome to having a try of the brand new release!
For the full release note and changelog: click here
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I have records from 2012 (successfully imported from previous Maxthon versions). Only a couple of months of records are being imported and definitely not even 720 days. I also tried freshly extracting 32bit (maxthon_portable_184.108.40.20600_beta_x86) as well as 64 bit (maxthon_portable_220.127.116.1100_beta_x64) portable versions into new folders and tried importing installed MX5 guest account from scratch but again and again same result.