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99.999% financially backed SLA

ETRN believes in giving our customers the best service possible. So we provide your business with a financially backed 99.999% (five nines) uptime service level agreement for all our services.

A 99.999% uptime SLA means that you should expect less than six minutes of downtime over the course of a year—and, if we should fail to deliver, we’ll compensate you for it.

Our competitors—including Office 365—only offer a 99.9% uptime guarantee. That's just three nines. And while that difference may not seem significant, the difference actually amounts to downtime of over 8 hours.

Availability % Downtime per year
99.8% 17.52 hours
99.9% (“three nines”) 8.76 hours
99.95% 4.38 hours
99.99% (“four nines”) 52.56 minutes
99.999% (“five nines”) 5.26 minutes
Source: Wikipedia, “High Availability”

How would your business suffer if you couldn’t communicate with your customers or coworkers for a whole day? Or even half a day? With ETRN’s five-nines uptime guarantee, you won’t have to find out.

How do we guarantee five nines availability?

We architect our cloud specifically for reliability, performance, and data protection. Read more about it in our white paper, HostedExchangeInfrastructure.pdf

We Answer Your Questions: FAQ

Q: What is the maximum e-mail attachment size?

A: The ETRN.com e-mail servers do not limit the size of individual e-mail attachments. The ETRN.com e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "over-sized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:

1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.

2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.