my 2 cents -
Runbox should switch from -
1) Linux to Mac OS
2) Dell to Apple (new 64 bit Merom Processors coming soon)
Apple might be costlier but low on maintenance. I read somewhere on Mac forum that when Linux people encounter 'bugs' it takes ages to resolve that problem. It seems that is the problem Runbox is having with IMAP ?
It might be a costly process and Runbox is a strong advocate for open source software but Macs do have a certain brand value (especially for American customers) and might attract more users.