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Hello Kaimu Dotting
Normally, with Exchange accounts, emails are primarily stored on the server rather than locally on your Mac. The Mail app only keeps a cached copy for offline access. When you remove the account, that local cache is also deleted.
If you want to keep emails locally, you would need to export them beforehand (for example, using Legacy Outlook for Mac to export emails to a local file).
Just to better understand your situation, when you say the account was “inactive,” do you mean you simply stopped using it, or has the mailbox already been inactivated, removed, or deleted from the server? Also, may I ask whether this is a work/school account or a personal account? This can affect the available retention and recovery options. If the mailbox has been inactivated or deleted on the server for several months, the data may unfortunately no longer be available.
If you have ever used Time Machine, you may still have a chance to recover your data by restoring a version from before you removed the account, and then importing it back into the Mail app.
Looking forward to your reply.
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