A specific version of this trials, that we call Teams Exploratory V1 trials (initiated between February 2020 and February 2021), allowed end-users to set up a trial with no expiration date (expiry year 2853). Trials initiated during that period are still active today, allowing users to benefit from a full Teams experience for free. Effective May 2022, Microsoft will initiate expiration of Teams Exploratory V1 trials.这种试验的一个特定版本，我们称之为Teams探索性V1试验（在2020年2月和2021年2月之间启动），允许最终用户设置一个没有过期日期的试验（过期年份2853）

CXPLAY World

https://www.microsoftpartnercommunity.com/t5/Modern-Work-Security/Microsoft-Teams-Exploratory-Trials-V1-Conversion-Opportunity-for/m-p/67586 #article

A specific version of this trials, that we call Teams Exploratory V1 trials (initiated between February 2020 and February 2021), allowed end-users to set up a trial with no expiration date (expiry year 2853). Trials initiated during that period are still active today, allowing users to benefit from a full Teams experience for free.

Effective May 2022, Microsoft will initiate expiration of Teams Exploratory V1 trials.

这种试验的一个特定版本，我们称之为Teams探索性V1试验（在2020年2月和2021年2月之间启动），允许最终用户设置一个没有过期日期的试验（过期年份2853）。在此期间启动的试验今天仍然有效，允许用户免费受益于完整的Team体验。
从2022年5月起，微软将启动Teams探索性V1试验的到期。