Recently, managed hosting provider NaviSite (navisite.com) has been rushing to fix an extended outage that has left thousands of its customers' websites offline for more than three days, but has slowly been bringing them back online since late Monday night.

According to a report by The Register, the interruption started Saturday as part of a planned move to replace a group of aging servers operated by Alabanza, which NaviSite recently acquired. NaviSite warned customers that their websites would be down for several hours during the migration, but unexpected issues caused the process to take much longer than originally anticipated.

Although the company has been communicating with its customers through constant updates on its website (navisite.com/sublevel.aspx?id=2017), many have expressed their displeasure with the extended outages through blogs.

NaviSite said it’s unable to gauge exactly how many websites were affected, but it said that Alabanza serves about 300 customers and those resell services to another 5,000 to 7,000 customers. However, some customers believe that the estimated number of affected websites is closer to 200,000, with one reseller claiming that he alone hosts close to 20,000 customers.

NaviSite has set up two numbers for customers who still don't have access to call.