It should be possible to extract data like contacts or calendars from Sony Ericsson backups (*.dbk) and save them in a form of Excel spreadsheet. This can be done with programs like phoneMiner.
Convert Sony Ericsson mobile phone backup to Microsoft Excel Open XML workbook and spreadsheet.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert dbk to xlsx on Windows
A backup and recovery software for smartphones
Convert from dbk file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.