You can use the fabulous imapsync tool to copy mails between IMAP servers. For example you can copy a certain folder from Apple’s iCloud to Google’s gmail:
--noauthmd5 --ssl1 --ssl2
--host1 mail.me.com --user1 'your.icloud.name'
--host2 imap.gmail.com --user2 'firstname.lastname@example.org'
--folder 'your/folder/to/be/copied' --sep1 '/'
--prefix1 '' --prefix2 '[Google Mail]' --sep2 '/'
The important parts here are the user names for the IMAP servers. Note that you need to generate an application specific password, if you are using Google two factor authentication! Also important is the “[Google Mail]” IMAP prefix.
Edit: It seems gmail has a weird interpretation of all the IMAP folders and stuff. Since they are using labels, the above script might create a weird label for the copied emails, but they will be there nevertheless!
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Ok, here is another bugger that annoyed me for quite some time: I am using Google Calendar as my main method of dealing with appointments and shared calendars. I use the mostly fabulous Apple iCal for managing those dates. However, if I create an event to be shared with several people, and I try to send an invitation to those people, this doe not work. In the event properties, I enter a list of Email adresses, hit “Send” and it never gets sent. The event is marked as “waiting for answers”, though. But that will never happen… So I have to fire up the Google Calendar website and resend the invitations manually. Bit annoying.
I haven’t found a correct problem description so far for this in the discussion boards over at Apple, but I’ll update this post if I find a bug description or some workaround. However, a preliminary search yields several problems relating to iCal and event invitations, but also with event invitations on Google calendars.