Disable encryption on the Exchange server
For 2007, 2010, and 2013 Exchange servers, Exinda recommends that encryption of the MAPI protocol should be disabled to maximize reductionmeasures the amount of redundant data that has been removed from the network, increasing capacity, as each user will encrypt files with a different key. You must disable encryption on all Microsoft Outlook clients as well as the Exchange server to maximize the benefit. See For more information refer to Turn off MAPI encryption in Microsoft Outlook.
NOTE
Encryption cannot be disabled on Exchange 2003 servers, but it will not enforce a policy requiring encrypted communications between Exchange and Outlook.
Turn off encryption on Exchange 2007 servers
- Open the Exchange Management Shell.
- At the command prompt, type the following command:
Set-MailboxServer <ExchangeServerName> -MAPIEncryptionRequired:$false
- To verify the change to the encryption status, type the following command:
Get-MailboxServer <ExchangeServerName>
Turn off encryption on Exchange 2010 and 2013 servers
- Open the Exchange Management Shell.
- At the command prompt, type the following command:
Set-RpcClientAccess -Server <ExchangeServerName> -EncryptionRequired $false
- To verify the change to the encryption status, type the following command:
Get-RpcClientAccess -Server <ExchangeServerName>