Paypal is back, why did it go down?

Paypal is back up. No explanations yet for what happened that had Paypal down for most of the day. I wonder how many sales were lost, how many websites are now looking for other payment gateways. It is not like there are not 100’s of them out there. What ever caused this has hit Paypal a large blow. People are not going to be so trusting with their money now. It only takes one time not being able to access my funds to make me to start looking around for another payment gateways. Even if it is just a back up so I can continue to do business if Paypal goes down again. At this point most sales at www.medievalmagic.ca are done threw Paypal but now we are going to spend the extra money to get the software so we can use other gateways. I am sure that there are a lot of other companies doing the same thing, not to mention the number of individuals who are going to start questioning using Paypal. I guess it all depends on what explanation they give every one. I doubt that they would tell us if some one hacked in and did this. It would destroy our perception of security. Not that people are not having their accounts broken in all the time, it is just usually because some one gave their information to the wrong people. Darn those scam emails. At this point in time most people feel secure using Paypal. However, I want to know why Paypal was down for so long.