既存のコミュニティをDiscourseへ移行する

[HAWK]

And there is this:

Preparing for and undertaking a platform migration

Migrating your community from one platform to another can be a daunting task. If you are planning a switch to Discourse, here are some tips to help things go as smoothly as possible. Early communication The biggest hurdle to overcome when migrating your community to another platform is fear of change. No one likes the unexpected, especially when it comes to a community that they feel invested in. You can mitigate this by briefing members on the upcoming transition in the weeks (or months) befo…

But yeah, FWIW we use both Mattermost and Discourse here at Discourse.