after my most recent device switch, a file appeared on my desktop called pool.bin and the free space in my C:\ drive dropped 5GB. I can't find any information about it anywhere much less a solution to the problem. I tried googling it and there was ONLY ONE search result that had anything to do with Blackberry. But the thread about it was from somebody running BES saying it was somehow related to MDS something or other.....i have not a clue. I run BIS on my Curve. This same thing happened to me when I was using a T-Mobile Pearl. I finally got rid of it when I had to (for totally unrelated issues) had to reinstall my XP. Somebody, anybody, HEEELLLPPPPP!!!