We currently don't show any sync progress on the current folder.

I would suggest the following.

• If any sync is happening the resource state changes to busy, we may want to indicate the busy status on the account switcher if any of the accounts is busy.
• I'm not sure if we need a general sync progress, but if you're syncing the current folder it would be nice to have a progress bar. I would therefore like to add progress information on top of the maillist for the current folder only. So if the current folder is being synchronized, we would get a progress indicator between the toolbar and the listview.