To import from Entourage, select some messages (or a folder) and press the capture key (F1 or fn-F1). EagleFiler will preserve the message flags, categories, and projects. EagleFiler skips messages that have been assigned the “OmitFromArchive” category in Entourage.
To import from multiple folders at a time, use a saved search (a.k.a. custom view) to show messages from multiple folders at once (for example, use “From Contains @” to show all messages), select all the messages, and press the capture key.
Dragging individual mailboxes or messages from Entourage to EagleFiler may work, but using the capture key is recommended because it is more reliable.