If we migrate user mailbox with appointment that contains in the location field same variations of values with “A1” then MNE will replace the value with the display name of an existing Exchange object. This is incorrect.
It looks that the MNE will use "find best" to find a valid object in the addresstranslation and set it as location value. We had tried with all combinations of the [Notes] AppointmentLocationSource=<#> all values between 0 and 4. We see the same result in all cases.
"A1" is just an example, it could be any value that also has a matching name in AD.