Generally,every tax preparation and accounting software supports the export (or printing) to PDF document nowadays. So it should be no problem to save old .t08 as .pdf documents. This of course creates only static document for printing, no further editing is possible.
Convert TaxCut 2008 tax return file to Adobe Portable document format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert t08 to pdf on Windows
A popular tax preparation software from HRB Digital
Convert from t08 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.