Comment 2 for bug 156288

Actually, rebooting is not needed, just close Kmail and open it again.

The attachment that is created before the closing, can be opened, after closing and opening of kmail, it can not be opened anymore.

In the Calender file (probably ~/.kde/share/apps/korganizer/YourName.ics) you can see that the message (before closing Kmail) is stored inside the calender file, like this:

BEGIN:VTODO
DTSTAMP:20071109T042729Z
ORGANIZER;CN=YourName:MAILTO:youraddress
CREATED:20071109T042728Z
UID:libkcal-971954918.358
LAST-MODIFIED:20071109T042728Z
DESCRIPTION:From: Me <email>\nTo:
 someone@wherever\nSubject: test
SUMMARY:Mail: test
PRIORITY:5
ATTACH;VALUE=BINARY;FMTTYPE=message/rfc822;ENCODING=BASE64;
 X-LABEL=kontactF5yczb.tmp:
 RnJvbTogQWNlIFN1YXJlcyA8YWNlQHN1YXJlcy5hbj4KUmVwbHktVG86IGFjZUBzdWFyZXMuYW
 4KT3JnYW5pemF0aW9uOiBTdWFyZXMgJiBDbwpUbzogaW5mb0BtYXJ0aWpucHJ1aWpzZXIubmwK
{rest of base64 encoded stuff removed}
PERCENT-COMPLETE:0
END:VTODO

After closing Kmail and opening it again, the same entry will look like this:

BEGIN:VTODO
DTSTAMP:20071109T042729Z
ORGANIZER;CN=YourName:MAILTO:youraddress
CREATED:20071109T042728Z
UID:libkcal-971954118.358
LAST-MODIFIED:20071109T042728Z
DESCRIPTION:From: Me <email>\nTo:
 someone@wherever\nSubject: test
SUMMARY:Mail: test
PRIORITY:5
ATTACH;VALUE=BINARY;FMTTYPE=message/rfc822;ENCODING=BASE64;
 X-LABEL=kontactOddYDb.tmp:??^G
PERCENT-COMPLETE:0
END:VTODO

(other variation:
X-LABEL=kontact9XNK6a.tmp:MAILTO:myemailaddress
)