Editing Apple Mail (section)

===Mac OS X Tiger (10.4)===
In [[Mac OS X Tiger]] (version 10.4), Mail version 2 included a proprietary single-message-per-file format (with the [[filename extension]] '''.emlx''') to permit indexing by [[Spotlight (software)|Spotlight]]. Additional features were:
* "Smart mailboxes" that used Spotlight technology to sort mail into folders.
* the ability to flag messages with a low, normal or high priority and to use these priorities in mailbox rules and smart mailboxes.
* tools for resizing photos before they are sent to avoid oversized email attachments.
* the ability to view emailed pictures as a full-screen slideshow.
* parental controls to specify who is allowed to send email to children.
* [[HTML]] message composition.

The new version also changed the UI for the buttons in the toolbar. Whereas previous buttons had free-standing defined shapes, the new buttons featured shapes within a [[Lozenge (shape)|lozenge]]-shaped capsule.<ref>{{cite web|url=http://inessential.com/2005/05/27/what_i_think_happened_to_mail|title=inessential: What I think happened to Mail|website=inessential.com|access-date=March 17, 2018|archive-date=March 18, 2018|archive-url=https://web.archive.org/web/20180318055040/http://inessential.com/2005/05/27/what_i_think_happened_to_mail|url-status=live}}</ref> According to many users, and even Apple's own [[human interface guidelines]] at the time, this was worse for usability.<ref>{{cite web|url=https://arstechnica.com/apple/reviews/2005/04/macosx-10-4.ars/3|title=Mac OS X 10.4 Tiger|website=arstechnica.com|date=28 April 2005|access-date=March 17, 2018|archive-date=9 May 2012|archive-url=https://web.archive.org/web/20120509073813/http://arstechnica.com/apple/reviews/2005/04/macosx-10-4.ars/3|url-status=live}}</ref> An open-source third-party application that reverted the icons to their former shapes was available. Nevertheless, Apple updated their guidelines to include capsule-shaped buttons, and the new UI persisted.<ref>{{cite web |title=Guides and Sample Code |url=https://developer.apple.com/mac/library/DOCUMENTATION/UserExperience/Conceptual/AppleHIGuidelines/XHIGIcons/XHIGIcons.html#//apple_ref/doc/uid/20000967-TPXREF102 |url-status=live |access-date=March 17, 2018 |website=developer.apple.com |archive-date=August 31, 2010 |archive-url=https://web.archive.org/web/20100831154127/http://developer.apple.com/mac/library/documentation/UserExperience/Conceptual/AppleHIGuidelines/XHIGIcons/XHIGIcons.html#//apple_ref/doc/uid/20000967-TPXREF102 }}</ref>