Several Microsoft partners are also providing migration services and tools. One of them is , based in Stamford, Connecticut.

Lucid Pointe has been providing OLSB migration services since the launch of Office 365, on whose implementations it specializes, said Robert Clark, managing principal at the company.

However, the demand for OLSB migration services began to pick up considerably at the beginning of March of this year, he said via email.

So far, Lucid Pointe has provided migration services to "dozens" of OLSB customers, all of them transferred to Office 365, he said. Lucid Pointe fees vary depending on the nature of the services provided and the complexity of the migration.

Asked whether it was still getting requests for OLSB migration services as of Monday, Clark said: "Yes, we are."