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Re:WordPress.com turns on HTTPS encryption for all websites by haroldp on Friday April 08, 2016 @04:06PM (#11457496)
But that doesn't really help you if you are using SNI to host multiple sites on a single IP address, does it?
Re:WordPress.com turns on HTTPS encryption for all websites by pfg on Friday April 08, 2016 @04:16PM (#11457570)
Internet Explorer doesn't support SNI on Windows XP, correct.

Let's Encrypt doesn't force you to use SNI, though. SNI is not something you "stick" on a certificate - it's a TLS extension which you don't have to use at all.