On the morning of Saturday, May 19, PBworks will be down for maintenance from midnight to 12:30 AM Pacific Time (3 AM Eastern/7 AM UTC/8 AM BST). During this time, the PBworks service will be offline; you won’t be able to log in, nor will you be able to access your site.
During these 30 minutes, we’ll be upgrading our infrastructure to better support our customers. We’ve tried to select a time when as few people as possible will be impacted. Once the maintenance is complete, you will be able to return to using the service as you normally do.
Thanks for being a PBworks user, and for your patience throughout this process.
PBworks Official Blog 
When does this happen?
what time is this in GMT?
Hi,
I am currently exploring to introduce PBworks in my TEAM. We are serving clients on a project based mode. Does PBworks deletes an account if it is not opened for a period of time?
I appreciate your prompt reply.
Its not my first time to go to see this web site,
i am browsing this web page dailly and obtain nice information from here every day.