To expand on Daniel's answer, if the user has an active HipChat account with an email address for company A and needs to use that same email address in company B, deleting the account should free that email address up. At this point the admin for company B can sign up the user with that email address.
HipChat Server/Data Center Support Engineer | Atlassian
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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