Hi @Anonymous
Do I have to subscribe to keep records such as previous contact file records?
Yes. Once the classic version expires, it cannot be used. You will have two options: one is to upgrade directly to paid, which will keep the previous data; The other is to use Teams for free, which is re-enabled, and all previous records will not be retained.
For more details, you could refer to: https://support.microsoft.com/en-us/office/upgrade-from-microsoft-teams-free-classic-to-microsoft-teams-29475bbd-a34f-4175-9b33-d44430f8ad39
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