Accessing Microsoft Teams using organizational or personal credentials
Hello, ve.popov,
For the chat history at least, you can try the steps outlined in the article to export data.
You would need to run a PowerShell command first then go to the Security and Compliance center, https://compliance.microsoft.com/homepage,
You may visit the link for the complete information.
https://regroove.ca/stellark/2019/07/02/how-to-...
Disclaimer: The last link above is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Thank you.