Formula Field: Salesforce Email Thread ID

Here’s a working formula to generate the Email Thread ID in Salesforce:

"ref:_" & LEFT($Organization.Id,5) & SUBSTITUTE(RIGHT(Organization.Id,10), "0", "" )& "._" & LEFT(Id,5) & SUBSTITUTE(Left(RIGHT(Id,10), 5), "0", "") & RIGHT(Id,5) & ":ref"