Cannot install or uninstall an Exchange Role after a failed disaster recovery install


You may get an error similar to the following:

image

Solution:

  1. Delete the DR Key (if it exist)
    1. open regedit
    2. go to HKLM\Software\Microsoft\ExchangeServer\<version>\<Installed Role>
    3. Delete the DisasterRecovery Key
  2. Delete the watermarks
    1. open regedit
    2. go to HKLM\Software\Microsoft\ExchangeServer\<version>\<Installed Role>
    3. Delete the ConfiguredVersion Key
  3. Re-run the install or /m:RecoverServer

MSKB: How to Recover a Lost Exchange Server

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