Setting up Microsoft Exchange (over IMAP)
Postbox can be used with Microsoft Exchange servers if they have IMAP support turned on. Here are some customizations to get the most out of using Postbox with your Exchange server
Change your Trash Folder
Exchange uses Deleted Items as the Trash folder.
On Windows select Options from the Tools menu, or on the Mac select Preferences from the Postbox menu.
Then click Accounts | <desired account> | Server Settings
[ ] Move it to this Folder [Trash]
Change Trash to Deleted Items.
Choose Copies & Folders if you want to change your Draft or Sent folders.
If you delete a message and the message still remains in your inbox
You need to turn on the following preference:
On Windows select Options from the Tools menu, or on the Mac select Preferences from the Postbox menu. Then go to Advanced / General / Config Editor, and in the textbox, paste in:
...and change the value of that preference to true.
You'll need to restart Postbox for this to take effect.
If it takes a long time to load a message
On Windows select Options from the Tools menu, or on the Mac select Preferences from the Postbox menu. Then click Accounts / < your server> / Server Settings
for the username field, if you entered your e-mail address including your domain name, try removing the domain name. i.e. instead of firstname.lastname@example.org, try using just scott.
If some of your Exchange folders aren't visible in the folder pane
Right-click on your inbox and choose Subscribe from the context menu. Make sure the missing folders are subscribed too.
Also, some Exchange servers work better with a certain setting. Go to Options | Preferences / Accounts / your Exchange account / Advanced Button.
Set this preference "show only subscribed folders" to OFF.