Highlighted below are the most glaring differences between JIRA 6 and 7. For more details, see Atlassian’s What’s New in JIRA 7.0.
Issues screen is now Statistics.
JIRA 6

JIRA 7. In the Activity screen, click Switch view, then choose Statistics.

Calendar link is missing.
JIRA 6

JIRA 7. Workaround: add JIRA Issues Calendar gadget to your dashboard.

Project Administration Link is at the Bottom
JIRA 6

JIRA 7. Project Administration link is at the bottom.

Attachments are Shown Differently
JIRA 6

JIRA 7. Choice between Thumbnails or List.

Fewer Choices for Gadget Refresh
JIRA 6

JIRA 7. The only Refresh interval is 15 minutes.

Gadgets are Not Listed by Default
JIRA 6

JIRA 7. Gadgets must be loaded. Known bug to be fixed in future release.
