Legacy exchange dn in the "to" field in outlook

Description of the error:

When booking coexistence a meeting room in Pronestor Planner, the meeting rooms outlook address is replaced with it's legacy exchange dn, for example

George Michael </o=[Our Domain]/ou=[Whatever User Group] (FYDIBOHF23SPDLT)/cn=Recipients/cn=gmichael> 

The error only happens with coexistence meeting rooms.



The problem is that the address book isn't updated. This is a microsoft error, so Pronestor can't fix it.

But there are several guides online on how to fix this in outlook.

For example this link

We have also used this fix to force outlook to update its address book:

  • Close outlook
  • Go to %userprofile%\AppData\Local\Microsoft\Outlook\ 
  • Search for all .OAB files
  • Delete all .OAB files
  • Restart outlook
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