An update to storage policies across your Google Account
The same happened to my old "...@hotmail.com" email, Microsoft deleted old childhood emails, still bitter about that.<p>Per <a href="https://answers.microsoft.com/en-us/outlook_com/forum/oemail-orestoremail/all-emails-from-my-hotmail-account-is-purged-what/627fea66-56c5-43eb-9cab-332d31c100ee" rel="nofollow">https://answers.microsoft.com/en-us/outlook_com/forum/oemail...</a> , the limit is 365 days of inactivity.