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By rename do you actually mean change the color of the flags? If so not possible.

Oops, I see they spell the color. Either way, not possible yet. Not sure it will ever be.

Not the colour. I just need to rename them so that I can actually use them. :|

This is weird.
 
One of the flaws of Apple's flags. I thought there was a third party app that allowed this though? I know it is not an idea solution.

I think I got it:

Code:
TI_UK-iMac:~ BLACKFRIDAY$ defaults write ~/Library/Preferences/com.apple.mail.plist "FlagNames" -dict \
> "0" -string "High Priority" \
> "1" -string "Work" \
> "2" -string "Hold" \
> "3" -string "Misson Accomplished" \
> "4" -string "See Later" \
> "5" -string "S.T.F.U." \
> "6" -string "Useless"

To change the default flag, use:
[1] is the second flag (the orange one)

Code:
TI_UK-iMac:~ BLACKFRIDAY$ defaults write ~/Library/Preferences/com.apple.mail.plist \ "FlagColorToDisplay" 1
 
I think I got it:

Code:
TI_UK-iMac:~ BLACKFRIDAY$ defaults write ~/Library/Preferences/com.apple.mail.plist "FlagNames" -dict \
> "0" -string "High Priority" \
> "1" -string "Work" \
> "2" -string "Hold" \
> "3" -string "Misson Accomplished" \
> "4" -string "See Later" \
> "5" -string "S.T.F.U." \
> "6" -string "Useless"

To change the default flag, use:
[1] is the second flag (the orange one)

Code:
TI_UK-iMac:~ BLACKFRIDAY$ defaults write ~/Library/Preferences/com.apple.mail.plist \ "FlagColorToDisplay" 1

There you go even easier. Fix it yourself.
 
Mail Help

Mail Help says: "In the sidebar, double-click a flag and then type a new name. For example, double-click Red and then type Urgent."But I don't see flags in the sidebar...
 
Mail Help says: "In the sidebar, double-click a flag and then type a new name. For example, double-click Red and then type Urgent."But I don't see flags in the sidebar...

When you have at least one message flagged, the sidebar will contain an entry named "Flagged", which, when selected, will show all flagged messages. If you click the small arrow to the left of "Flagged" to expand the entry, it will then show each colour of flag on its own. You can then double click the colour name and rename it like you would anything else.
 
Take a few messages and flag them with various colors. The flags will appear in sidebar. Rename them in the sidebar. Done.
 
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