Migrating to MsgFiler 4
Support has ended for MsgFiler Classic. If you have upgraded to macOS Sonoma and are lamenting the fact that Mail Plug-Ins have been removed from the Mail app, you should purchase MsgFiler 4.
There are many new features in MsgFiler 4 that users have requested over the years, including:
- favorite mailboxes 
- recent mailboxes 
- ability to create new mailboxes from within MsgFiler 
- configurable default action 
- exclude mailboxes 
- match on mailbox names only 
- restrict search to selected accounts 
- full keyboard access 
Differences Between the Application and Classic Plug-In
The previous version of MsgFiler came in the form of an Apple Mail Plug-in. Because the Mac App Store guidelines restricts plug-ins, MsgFiler has been rewritten to be a standalone application that communicates with Mail via AppleScript. Differences between the plug-in and the application are noted below:
- Hide Offline and Inactive Accounts MsgFiler 3.0 does not have the ability to determine whether a mail account is offline or inactive. 
- Mark as Read Due to AppleScript performance issues, the Mark as read feature has been removed from the application. From within MsgFiler, however, you can press - Command-Shift-Uto toggle the read/unread status of messages before you file them.
- Loading Mailboxes The plug-in, by virtue of being integrated with Mail, is faster at loading and reloading of mailboxes. 
- Filing To Remote Mailboxes MsgFiler’s performance is slower than filing with the plug-in because MsgFiler must use AppleScript, whereas MsgFiler Classic has access to an internal method within the Mail application for filing. 
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