As a quick-n-dirty test I used a PC running Windows 2000, OpenOffice.org v2.0 and MS Office 97 to build
.pdf files of quotes submitted to me as an Excel spreadsheet (one printed page) and a Word document (8 pages). The
.pdf engine used with word and Excel was Software995's pdf printer driver. I accepted the default settings for pdf creation in both OOo and MS Office apps.
The OOo spreadsheet.ods was 16K, the Excel spreadsheet.xls was 24K in size. The OOo document.odt was 38K, the Word document.doc was 131K in size. In fairness, the documents did contain VB macros that the .odt file did not save. The OOo spreadsheet.pdf was 120 KB , the Excel spreadsheet.pdf was 32KB in size. The OOo document.pdf was 200KB, and the Word document.pdf was 100KB in size. I will check PDF creation on these same documents from my Linux box at home to complete the comparison. My curiosity will then be satisfied.
To me, the expense of archiving data files is of greater interest that the expense of RAM needed to support the software. I must archive documents for many years. Disk space requirements are constantly growing, while the RAM in each PC is reusable.