
Hello,
I'm not an expert,but ebooks are in various formats and you need the correct ebook reader for the format you got.Microsoft Reader I think only reads .lit files,not .txt,pdb etc.I manly use isilo that reads .txt,.pdb,and you can convert html to iSilo with the free isilox.
Did you convert your PDF file on the computer,before putting it on the Axim?I dont think the reader will read unconverted files.I find the Adobe reader difficult anyway,its slow and difficult to read.The only way I've found reading PDFs on a handheld is practical,is to convert you files with Repligo PDF Mobilizer and view them with the free Repligo viewer.
I hope this helps?