Last month I was asked to perform a Cutover migration from Exchange Server 2007 to Exchange Online on Office 365. After I created the Migration Batch on Exchange Online, I got an error about the SSL/TLS certificate of Exchange Server 2007. Although I could not find any relevant information on Microsoft Docs, it appears that the version of TLS in Exchange Server 2007 is 1.0, which is considered deprecated by Exchange Online and, thus, not supported. However, I found no way to upgrade to TLS 1.3 so that the Cutover migration work for my case.