<p>The sheer size of legacy mailboxes at the Environmental Protection Agency some of them with more than a million messages in them threatened the agency's transition to Office 365, Microsoft's cloud-based collaboration and communication service.</p><p>EPA officials discovered that hitch as they worked with Lockheed Martin and Microsoft to move 25,000 employee mailboxes to Microsoft Office 365 for Government, a multitenant service that stores U.S. government data in a segregated community cloud and includes e-mail, calendars, scheduling and collaboration tools for internal and external use.</p><p>"EPA wanted an extremely aggressive migration schedule," said Lynn Singleton, director of environment services for Lockheed Martin. "I don't know if they understood what they were really asking for when it came to the amount of work that had to occur over the relatively short amount of time," Singleton said.</p><p>EPA officials brought in Lockheed Martin in September 2012 and wanted the primary migration to be completed by early 2013. Migration work was completed over the Presidents' Day holiday weekend in February, Singleton said. The move to Office 365 is expected to save the EPA approximately $12 million over the four-year contract period.</p><p><a href="http://gcn.com/articles/2013/03/08/million-message-mailboxes-complicate-epa-move-office-365.aspx">Keep reading...</a></p>