Useit Fax Server v9 a powerful.NET fax service that supports fax/mail for Office 365 and Gmail as well as Microsoft Exchange, MFP fax integration and web-based administration. All this is supported by outstanding support. Useit Fax Server v9 - A powerful.NET fax machine that supports fax/mail for Office 365 and Microsoft Exchange, Gmail and Microsoft Exchange, MFP fax Integration, web-based administration, and stellar support. As your business grows, you can keep the initial cost low and scale up your fax server. It's easy and quick to add lines or DIDs. Talk to a solution expert today about designing a fax server that meets your needs and is affordable. Comprehensive web-based reporting of fax metrics. Personalize email templates with your logo and customize them.