The PlayStation Network will be offline in Europe from 4:05 p.m. GMT on Wednesday, March 9 until 3 a.m. on Thursday, March 10. The network will be down for scheduled maintenance, according to a post on the official European PlayStation Blog.
You will not be able to access the PlayStation Store on your PlayStation 3 or PSP, your Account Management, and your Account Registration. You also will not be able to access your PSN account from eu.playstation.com. Maintenance will not impact Trophies, so you can still go fishing for gold during the downtime. Also, if you wish to play online during maintenance, make sure you stay signed in prior to 4:05 p.m. on Wednesday.