Why did hotmail delete all of my emails that were associated with a "linked" account to my primary account?

I linked my two email accounts.  All the emails associated with the secondary account were deleted.  If Microsoft has a practice of deleting email, why couldn't it have either merged the two accounts or notified me via email to my primary account about its pending automated deletion of email associated with my secondary account?  This practice is so unacceptable.  How do I get my emails back?  Microsoft's automated support just says "sorry, your email is permanently deleted"