Many OLSB customers are still related to the migration in , social media sites and blogs, as the clock ticks.

It's unclear how many OLSB customers remain oblivious to the suite's impending shutdown. OLSB is used primarily for email communications and website hosting.

Microsoft still plans to start dismantling OLSB after midnight U.S. Pacific Time on Tuesday, when it will start taking down OLSB-hosted websites, a Microsoft spokeswoman confirmed.

However, Microsoft will keep operational the Windows Live Hotmail custom email addresses hosted by the service for six months, she said via email.

Microsoft will also provide an that OLSB customers who miss today's deadline can fill out to recover lost website data, she said.