Update Set-OwaMailboxPolicy.md

Adding changes for ItemsToOtherAccountsEnabled.

Author: pmfabianperez

exchange/exchange-ps/exchange/Set-OwaMailboxPolicy.md

@@ -1394,7 +1394,12 @@ Accept wildcard characters: False
 ### -ItemsToOtherAccountsEnabled
 This parameter is available only in the cloud-based service.
 
-{{ Fill ItemsToOtherAccountsEnabled Description }}
+The ItemsToOtherAccountsEnabled parameter specifies whether users can move or copy emails between accounts. Valid values are:
+
+- $true: Users can move and copy emails to and from external accounts.
+- $false:  Users cannot move or copy emails to and from external accounts. This is the default value.
+
+**Note:** This policy does not affect moving or copying emails between Groups and Shared Mailboxes within the same tenant.
 
 ```yaml
 Type: System.Boolean