legacyExchangeDN has to be written as an x500 address in the proxyAddresses attribute in the target directory to maintain replyability and calendaring when also migrating mailbox data.

legacyExchangeDN is written implicitly by PowerSyncPro Directory Synchronisation as part of default processing when Mail-Enable is selected.

Default processing

PSP will always process the following attributes when Mail-Enable is selected.

• mail
• mailNickname
• proxyAddresses
• groupType
• reportToOrignator

If those attributes are present on the source object, they will be written to target.  The legacyExchangeDN is written to the proxyAddresses attribute as an x500 address.

If they are not present, PSP will build them and set the appropriate target attributes i.e.  

sAMAccountName to mailNickName

NOTE:  If the mail attribute is not present on the source object, then no mail attribute will be written to the target.  This is by design.

Plus the following attributes are written for mail-enabled users if the target schema is extended for Microsoft Exchange

• legacyExchangeDN This is created as a GUID + sAMAccountName
• msExchRecipientDisplayType set as required for User/Group/Contact
• msExchRecipientTypeDetails set as required for User/Group/Contact [TvB8] [CM9] 
• showInAddressBook set per target if present in the Address Lists Container in the Configuration\Services\Microsoft Exchange\[org]

NOTE:

msExchVersion is NOT set by default.  If you have a reason to set this then please create a mapping and if necessary, use a Simple Expression to hard code a value.

msExchRemoteRecipientType is also not set by default.  If you have a need to set this to control the mailbox in Microsoft 365/EXO, then use Complex Expressions to get / set msExchRecipientDisplayType, msExchRecipientTypeDetails and msRemoteRecipientType as desired