It is normal behavior of Exchange Server to allow the recipient to modify a
recieved message and save it back to the Server.
If a sender does not want this to happen, they have to select the option to
make the message private. See following Extract from MS Outlook Help:
Mark a message as private, personal, or confidential
1 In the message you want to set the sensitivity level for, click Options .
2 In the Sensitivity box, click the option you want.
Marking a message Private prevents the message from being modified after
you send it.
You can mark all of the messages you send with the same sensitivity level.
On the Tools menu in the main window, click Options, click the Preferences
tab, and then click E-Mail Options. Click Advanced E-Mail Options, and then
in the Set sensitivity box, click the sensitivity level you want.
>I'm unsure if this is a known feature of Outlook 98 / Exchange 5.5 but ...
>Having recently set up our Exchange Server we were sending some messages
>back and forth for testing purposes. Using Outlook 98 as our client we
>discovered that we could open messages we had received, make changes and
>then choose File / Save to save these messages back to Exchange.
>There was no evidence that we could find that the message had been tampered
>with. Now we are questioning the viability of our planned migration from
>GroupWise -> Exchange, as non-repudiation of email is a fundamental
>Is this a known bug / feature & if so is there a workaround / configuration
>setting to remove the possibility of making this sort of change?
>Hope somebody can help,