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Exchange 2013 Error: The global catalog verification failed

Working on Exchange 2013 and adding permissions to a mailbox, I get:

Active Directory operation failed on exchange.domain.tld. This error could have been caused by user input or by
the Active Directory server being unavailable. Please retry at a later time. Additional information: Additional
information: The global catalog verification failed. The global catalog is not available or does not support the
operation. Some part of the directory is currently not available.
Active directory response: 000020E1: SvcErr: DSID-03200672, problem 5002 (UNAVAILABLE), data 0

 Here's how to fix:

• -delete the files in: C:\Users\administrator\AppData\Roaming\Microsoft\MMC
  (or C:\Users\administrator.<foo>\AppData\Roaming\Microsoft\MMC)
• -re-run the command: Add-MailboxPermission foo.user -User foo.user2 -AccessRights FullAccess -InheritanceType All
• set-mailbox foo.user -GrantSendOnBehalfTo foo.user1,foo.user2,foo.user3

That is all.