What is the difference between the manditory-registration 3.5 and
Calypso 3.3 which you can download without any requirements?
New features in Version 3.5
* "Color Markers" can be applied like labels to certain messages, or
to a folder in the folder tree pane. Up to 64 unique font & background
colors can be defined. Markers can be assigned to messages or folders
manually, and filters can apply markers to messages automatically.
Summary window can sort messages by Marker setting.
* Toggle between Plain Text and HTML View mode in Message, Compose or
Preview Pane windows using Ctrl-W or the "HTML" tool bar button
* Plain Text viewing functionality for HTML messages with no text
portion (automatic HTML tag stripping).
* New filter option to strip HTML, saving only a text version of the
message and deleting the HTML portion.
* New filter option to verify message sender's address appears in
address book (a.k.a. "White List" functionality).
* Customizable security settings for viewing HTML mail, such as
disabling Active X, executable scripts, and automatic downloading of
linked images in messages.
* Optional sequential numbering of replies in a thread (inserting
[1], [2] etc. alongside the RE: portion of the subject).
* Fully mappable file importing for Address Books - import your
addresses from virtually any other mail program.
* Enhanced support for SMTP authentication.
* Quickly change SMTP settings for some or all accounts at once
(great for laptop users who change their Internet connections).
* Timed "Auto Save" of message compositions.
* Mail check interval can be set on a "per-account" basis.
* Hot Key support for the POPFile "Classify" function.
Interface Enhancements in Version 3.5:
* CTRL + Drag and Drop offers same choices as Right-Mouse Button +
Drag and Drop, consistent with Windows Explorer functionality
* F4 sends all pending messages.
* Total/Selected/Unread Item counts in tool bar
* Sorting now ignores "" or < > characters around names.
* Account setting to disable toggling of "Save Copy of Sent Message"
in Compose view.
* Editing and saving a sent message retains the original time stamp.