Moving from the downstream bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=475013

Evolution is configured for imap and the "Drafts" folder is defaulted to the
imap server.  When switching to off-line mode and composing an email, when
attempting to save an email to the "Drafts" folder it appears to save without
any errors.  The email closes but is _not_ saved to the "Drafts" folder.

Version-Release number of selected component (if applicable):

evolution-perl-2.24.2-1.fc10.x86_64
evolution-webcal-2.23.91-1.fc10.x86_64
gnome-python2-evolution-2.23.0-1.fc10.x86_64
evolution-spamassassin-2.24.2-1.fc10.x86_64
evolution-2.24.2-1.fc10.x86_64
evolution-data-server-2.24.2-1.fc10.x86_64

Fedora 10
2.6.27.5-117.fc10.x86_64

How reproducible:

every time

Steps to Reproduce:
1.  Open Evolution
2.  Switch to off-line mode
3.  Compose email
4.  Save to "Drafts"

Actual results:

Email doesn't save to "Drafts"

Expected results:

An error should at least pop up to specify that the imap server is not
available and give you the option to save the email to the local computer.

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I can reproduce this too. As long as I'm in an offline mode, I can see the message in the IMAP's Drafts folder, but when going online the message disappears. I see also the zero-size journal file in the Drafts folder, before going online.