So this comes up a lot. You have a field in AD but your script will not modify it. You need to change the field attribute to the new entry but the logical commands (like -delete or $Null) don’t work and just return errors.
These special fields require a combo command request which combines get-aduser with set-aduser. Then you simply enter a -clear command and you’re all done.
I don’t know why this is such a hard thing to find a solution for on the internet. Most of the sites I visited had overcomplicated lines of code for this simple command.
Here is the entire command in use to clear the (email) field in AD.
get-aduser samname | set-aduser -clear mail
Example: get-aduser bsmith | set-aduser -clear mail
The “samname” is the account logon name. Example: bsmith
Here is a pretty decent list of all the field names:
| accountExpires |
| accountNameHistory |
| aCSPolicyName |
| adminCount |
| adminDescription |
| adminDisplayName |
| allowedAttributes |
| allowedAttributesEffective |
| allowedChildClasses |
| allowedChildClassesEffective |
| altSecurityIdentities |
| assistant |
| badPasswordTime |
| badPwdCount |
| bridgeheadServerListBL |
| c |
| canonicalName |
| cn |
| co |
| codePage |
| comment |
| company |
| controlAccessRights |
| countryCode |
| createTimeStamp |
| dBCSPwd |
| defaultClassStore |
| department |
| description |
| desktopProfile |
| destinationIndicator |
| directReports |
| displayName |
| displayNamePrintable |
| distinguishedName |
| division |
| dSASignature |
| dSCorePropagationData |
| dynamicLDAPServer |
| employeeID |
| extensionName |
| facsimileTelephoneNumber |
| flags |
| fromEntry |
| frsComputerReferenceBL |
| fRSMemberReferenceBL |
| fSMORoleOwner |
| garbageCollPeriod |
| generationQualifier |
| givenName |
| groupMembershipSAM |
| groupPriority |
| groupsToIgnore |
| homeDirectory |
| homeDrive |
| homePhone |
| homePostalAddress |
| info |
| initials |
| instanceType |
| internationalISDNNumber |
| ipPhone |
| isCriticalSystemObject |
| isDeleted |
| isPrivilegeHolder |
| l |
| lastKnownParent |
| lastLogoff |
| lastLogon |
| legacyExchangeDN |
| lmPwdHistory |
| localeID |
| lockoutTime |
| logonCount |
| logonHours |
| logonWorkstation |
| managedObjects |
| manager |
| masteredBy |
| maxStorage |
| memberOf |
| mhsORAddress |
| middleName |
| mobile |
| modifyTimeStamp |
| mS-DS-ConsistencyChildCount |
| mS-DS-ConsistencyGuid |
| mS-DS-CreatorSID |
| mSMQDigests |
| mSMQDigestsMig |
| mSMQSignCertificates |
| mSMQSignCertificatesMig |
| msNPAllowDialin |
| msNPCallingStationID |
| msNPSavedCallingStationID |
| msRADIUSCallbackNumber |
| msRADIUSFramedIPAddress |
| msRADIUSFramedRoute |
| msRADIUSServiceType |
| msRASSavedCallbackNumber |
| msRASSavedFramedIPAddress |
| msRASSavedFramedRoute |
| name |
| netbootSCPBL |
| networkAddress |
| nonSecurityMemberBL |
| ntPwdHistory |
| nTSecurityDescriptor |
| o |
| objectCategory |
| objectClass |
| objectGUID |
| objectSid |
| objectVersion |
| operatorCount |
| otherFacsimileTelephoneNumber |
| otherHomePhone |
| otherIpPhone |
| otherLoginWorkstations |
| otherMailbox |
| otherMobile |
| otherPager |
| otherTelephone |
| otherWellKnownObjects |
| ou |
| pager |
| partialAttributeDeletionList |
| partialAttributeSet |
| personalTitle |
| physicalDeliveryOfficeName |
| possibleInferiors |
| postalAddress |
| postalCode |
| postOfficeBox |
| preferredDeliveryMethod |
| preferredOU |
| primaryGroupID |
| primaryInternationalISDNNumber |
| primaryTelexNumber |
| profilePath |
| proxiedObjectName |
| proxyAddresses |
| pwdLastSet |
| queryPolicyBL |
| registeredAddress |
| replPropertyMetaData |
| replUpToDateVector |
| repsFrom |
| repsTo |
| revision |
| rid |
| sAMAccountName |
| sAMAccountType |
| scriptPath |
| sDRightsEffective |
| securityIdentifier |
| seeAlso |
| serverReferenceBL |
| servicePrincipalName |
| showInAddressBook |
| showInAdvancedViewOnly |
| sIDHistory |
| siteObjectBL |
| sn |
| st |
| street |
| streetAddress |
| subRefs |
| subSchemaSubEntry |
| supplementalCredentials |
| systemFlags |
| telephoneNumber |
| teletexTerminalIdentifier |
| telexNumber |
| terminalServer |
| textEncodedORAddress |
| thumbnailLogo |
| thumbnailPhoto |
| title |
| tokenGroups |
| tokenGroupsGlobalAndUniversal |
| tokenGroupsNoGCAcceptable |
| unicodePwd |
| url |
| userAccountControl |
| userCert |
| userCertificate |
| userParameters |
| userPassword |
| userPrincipalName |
| userSharedFolder |
| userSharedFolderOther |
| userSMIMECertificate |
| userWorkstations |
| uSNChanged |
| uSNCreated |
| uSNDSALastObjRemoved |
| USNIntersite |
| uSNLastObjRem |
| uSNSource |
| wbemPath |
| wellKnownObjects |
| whenChanged |
| whenCreated |
| wWWHomePage |
| x121Address |
Reality Decoded 
Thanks I’ll save this
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