Final answer:
It is true that longer memos are often converted to PDF files to maintain consistent formatting and for easier sharing. PDFs are widely used in business communications for their security and compatibility across different devices.
Step-by-step explanation:
The assertion that longer memos are often converted to PDF files and attached as messages is True. This practice is common in the business and professional world because PDFs maintain consistent formatting regardless of the software or device used to view them.
Additionally, PDF files are generally more secure and can be easily shared and printed. By converting longer memos into PDFs, companies ensure that the document's layout, graphics, and overall presentation remain intact for the recipient.