A context menu entry to invoke the filter wizard on an already moved message
would be great. It should set the target folder as the folder which the email
currently resides in. This way filters can be created after the mail already
has been dragged to its new folder.

Renaming this request, as the core of this function is the creation of filters
based on current location only (without the added benefit of detecting the
"from" location from the drag and drop operation).

Created an attachment (id=7503) [details]
1.6 prerelease 10

This prototype has an additional menu entry "QuickFilters: Create Filter from
message" in the Messages Menu.

- only works if exactly one message is selected - error message otherwise
- determines the original inbox from the root folder of the current folder
(this is not quite correct as the email can have been moved from an Inbox from
a different mail account)
- currently only works in English and German locale! Do not install in
different language setting as it might mess up your messages menu.

to do: determine original mail account

Created an attachment (id=7504) [details]
1.6 Prerelease 12

This prototype has an additional menu entry "QuickFilters: Create Filter from
message" in the Messages Menu.

- only works if exactly one message is selected - error message otherwise
- determines the original inbox from the root folder of the _original_ folder 
- currently only works in English and German locale! Do not install in
different language setting as it might mess up your messages menu.
- the algorithm that detects the original rootfolder is so far only tested with
POP3 mail! Not sure if it will work that well if the mail was moved from an
IMAP account

I confirm prerelease12 works perfect on thunderbird 17.0.2 and windows 8. using
pop3 email protocol. 

Created an attachment (id=7507) [details]
1.6 Prerelease 26

This prototype has an additional menu entry "QuickFilters: Create Filter from
message" in the Messages Menu amd also one in the context of the message menu
(located above the "Save As..." item)

- only works if exactly one message is selected - error message otherwise
- determines the original inbox from the root folder of the _original_ folder 
- the algorithm that detects the original rootfolder is so far only tested with
POP3 mail! Not sure if it will work that well if the mail was moved from an
IMAP account
- new actions include: message priority, flag, tags
- working locales included: en, de, zh-CN, nl, fr, sv-SE, it