Article ID: 979790 - View products that this article applies to.
A user access a Microsoft Exchange Server 2010 mailbox by using an Internet Message Access Protocol 4 (IMAP4) client. The IMAP4 client crashes if there are S/MIME messages in the mailbox.
This problem occurs because Exchange Server 2010 returns negative values for message size, which is incompatible with RFC.
To resolve this problem, install the following update rollup:
(http://support.microsoft.com/kb/982639/ )Description of Update Rollup 4 for Exchange Server 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about IMAP4, visit the following website:
General information about IMAP4