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=== PDF Viewer ===For a PDF sent as an attachment to an email, the native BlackBerry OS will read it, for free. If you need to view PDF files on your Media Card you have mostly PDF viewers out there that are not free.Pay Applications:* BeamReader* Repligo* PDFtoGoFree Option:* The native email attachment PDF view will not view PDF files saved on the memory card. It also does not zoom well. It has no "read" mode so when zoomed in you may find the image to blurry if there is text to read.* Docs2Go doesn't include a PDF reader unless you register it. Register it and you'll get a PDF viewer. Yes it's free. [http://forums.crackberry.com/blackberry-curve-83xx-f52/free-pdf-viewer-155988/ source]=== Blackberry Running Slowly ======= Clear Out the Event Log ====From your Home Screen of icons, press and hold the ALT key and type “LGLG” (Do not press the SHIFT key at the same time) to bring up the Event Log screen as shown. Press the MENU key and select “Clear Log”. Then select “Delete” when it asks you to confirm and finally press the ESCAPE key to get back to your Home Screen. ==== Automatic Memory Cleaning ====Options icon and click on “Security Options.” Glide down and click on “Memory Cleaning” Change the “Status” to “Enabled.” Once enabled, you will see more options. I recommend leaving the first two as “Yes” and adjusting the Idle Timeout down from 5 minutes to 1 or 2 minutes. Finally, if you want, you can “Show Icon on Home Screen.” Save your changes.==== Close Apps ====Hold the menu key find some apps in this list that you aren’t using, open them and close the app. Remember, an app is still running unless you open the app, press menu and select “close” or “exit”. Alt + Esc also shows running apps.