When creating a Teams migraiton task, you have the option to Archive channel posts that are older than 15 or 30 or 60 days or to migrate All messages from the channel.
When selecting the desired configuration, for example "Messages older than 15 days", ODM will check the source channel and archive all posts from that to the target which are older than 15 days, which have been created 15 days ago or further back.
In case a source post has been updated with a comment, and appears to be the most recent post in the source channel, they will still be archived, if the post was created before the configured time period.
The archive file will be shared in the target channel conversation with all the archive posts from the source and it will be stored in the associated SharePoint Site.
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