Hamilton Beach Corp have migrated to Google Cloud for email. Read More:

"Hamilton Beach Brands, a designer and marketer of small household and commercial appliances in the US, also dipped a toe into cloud computing via e-mail. When the time came to upgrade Lotus Notes last year, the appliance company hesitated.
Hamilton Beach hadn't refreshed Notes in three years and Jerry Hodge, senior director of information services, knew jumping from Notes 6.53 to version 8 would force him to upgrade his IBM iSeries servers and retrain the 500 users on the system. A lot of expensive work just for e-mail, he thought.
Hodge (the CIO) asked his staff to look into Google's Gmail service, among other alternatives. E-mail hasn't been a competitive differentiator for years, he reasoned. By subscribing to Gmail for a monthly per-user fee, Hamilton Beach would avoid the expense of new hardware, software licenses and training. Because Google provides archiving and retrieval, Hodge also figured he'd save on items such as backup tapes and disks and the IT labour to support electronic discovery for lawsuits or audits.
"Over five years, the cost would be half," he says, looking at a spreadsheet comparing the Notes upgrade to Gmail. Such savings in capital and ongoing operating expenses were too compelling to pass up, he says.
"Let someone in the cloud run e-mail and free up my guys' time to work on stuff that does make a difference."

http://www.cio.com.au/article/309978/cloud_computing_special_part_2_cloud_control?pp=5