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Ability to print from desktop application (All OS's)
DE
Contact list
Change tasklist heading to show a filter's name rather than its definition
Mindmap mode
Follow up section
RH
Show the total of open tasks accross all projects
Mindmap View
Add ability to "attach" online docs that are in Google Drive
UI
O
Task Color Highlighting for Status/Progress
M
allow drag and drop sorting in "Today" and "Next 7 Days" views
T
Not technical but a simple marketing suggestion
Localized textual due dates Closed
AC
Provide Monthly Payment Plan Closed
SK
Change order of tasks due today
AS
Pop Ups
J
Make translations right (creating events)
BW
Project Auto-Complete
RC
Share tasks independently of Projects
L
Integrate with IFTTT