Mail refusing to Lock

[zsolt]

So none of the ejecting methods worked because the files are indeed in use, i.e. locked and the OS does not allow you to eject the volume. This is the line from the console showing that:
The operation couldn't be completed. (OSStatus error -47.)" (fBsyErr: File is busy (delete))

The open files seem to be the following:
com.apple  762   mf  txt      REG                1,8     32768   639477 /Users/mf/Library/Mail/V2/MailData/Envelope Index-shm
com.apple  762   mf    6u     REG                1,8 206848000   639476 /Users/mf/Library/Mail/V2/MailData/Envelope Index
com.apple  762   mf    7u     REG                1,8   1676872   639478 /Users/mf/Library/Mail/V2/MailData/Envelope Index-wal
com.apple  762   mf    8u     REG                1,8     32768   639477 /Users/mf/Library/Mail/V2/MailData/Envelope Index-shm
com.apple 1389   mf  cwd      DIR                1,1       374   436438 /Users/mf/Library/Containers/com.apple.MailServiceAgent/Data

The strange is that it says it is com.apple which locks them. But there are also two process IDs shown, then 762 and the 1389, so pls run the following command:

ps -ef | grep 762 and ps -ef | grep 1389
This will list the process details for each process ID.

BTW on my mac, once I quit mail, at first the lsof for Mail showed
MacBookAir:~ macme$ lsof | grep Mail
SystemUIS  8925 macme  txt      REG                1,2    380069 3233963 /Applications/Mail.app/Contents/Resources/document.icns
mdworker  27337 macme    4r     REG                1,2     15364 6063211 /Users/macme/Library/Mail/V2/.DS_Store
mdworker  27339 macme  txt      REG                1,2     21488 7166495 /System/Library/Spotlight/Mail.mdimporter/Contents/MacOS/Mail

but soon after the last two lines went away as the mdworker (spotlight) finished it's job, so in my case I would be able to eject.

Rgds
Zsolt