For sharing and storing electronic files in a law office, PDF is often your best file format choice.
In the legal industry, in order for a document to be admissible in court it must be in a format that cannot be altered without leaving an electronic trail.
Though there are quite a few file format options (TIFF, JPEG, or GIF) that are unalterable without also creating an electronic trail. Print documents can be scanned and saved to these formats. Born digital documents can be saved to these file formats. But there is one option that is the most economical and practical – PDF.