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Is ExQuilla free software (either without cost, or free to modify)?
Free as in without cost
Currently, ExQuilla is free of charge to use. ExQuilla versions 52.* and earlier require a license to function, but those licenses are being given out automatically without charge from our license server. ExQuilla versions 60.* will not require a license.
If you need a license for ExQuilla, go to this page to get a free license: http://mesquilla.net/buylicense.html
Prior to March 2018, ExQuilla required a paid license to function, which cost approximately $10 per year for a single user. Those licenses were valid for a year after purchase. In reviewing the likely future of Thunderbird as well as my personal circumstances, there are serious doubts about whether an extension as complex as ExQuilla will be viable in major releases of Thunderbird past version 60. The next major release of Thunderbird, version 67, will likely be released in March 2019. It did not appear that I could guarantee licensed ExQuilla users compatibility with the current version of Thunderbird once Thunderbird 67 is released, so I decided to stop selling licenses in March 2018, and allow free use of ExQuilla.
The future of ExQuilla licensing and compatibility in Thunderbird 67 and beyond is currently undecided, but the most likely path is that ExQuilla will not function in Thunderbird versions 67 and later that will release in March 2019.
Free as in freedom to modify
If you want to contribute changes to ExQuilla, you are free to post pull requests, but I will require that rights be assigned before incorporating any changes.