Bob, Thanks for the idea ... I have a similar situation and your solution looks like a good one. It seems that no one replied to your query so I'll take a stab at it. Could it be a permissions problem? You might want to check the file and see if you have read/write privileges. Otherwise, I wonder if the file needs to be inside the Mail folder or at least a folder to which you have permission. Just a thought. Milton On Feb 13, 2006, at 12:58 AM, Bob Aldridge wrote: > I'm hoping one of you out there has done this and can tell me what > I'm doing wrong. > > I'm trying to convert mail from Outlook Express (WIN 98) to > Mail.app. (10.4.4) > > I know that Mail.app will import mail in the .mbox format, so on > the PC I installed Thunderbird and imported the mail to Thunderbird. > > Then I copied the converted mail file over a network to the iMac G5. > > Ran Mail.app, import but the Thunderbird file is "greyed out", and > Mail.app won't let me import it. >