hello ... I've got problem on edge server exchange2007 with password protected zip files. Emails with nonparsable zip type attachements are blocked with 550 5.7.1 Message rejected due to unacceptable attachments ## I found issue on technet KB936734 . recommended rollup5 was not installed on server but on server is sp1 installed for exchange2007 , but error still remain. Need I install rollup5 on server ? SP1 is already on. .scripthide {display:none;} .scriptinline {display:inline;} .scriptblock {display:block;} .script12hide {display:none;} .script12inline {display:inline;} .script12block {display:block;} .lnav {position:absolute;} .lnavch {margin-left:23.0ex;} .script13hide {display:none;} .script13inline {display:inline;} .script13block {display:block;} Thank you for any advice.

Hi, I've got the same problem. I also have SP1 installed but problem still goes on. I found Accumulative Rollup 3 for exchange 2007 sp1 available, it was also installed but no luck. I still have "Message rejected due to unacceptable attachments".Any help would be appreciated.