When comparing Microsoft Outlook vs Rooster: Calendar and Tasks, the Slant community recommends Rooster: Calendar and Tasks for most people. In the question“What are the best calendar apps for iPhone?” Rooster: Calendar and Tasks is ranked 10th while Microsoft Outlook is ranked 15th. The most important reason people chose Rooster: Calendar and Tasks is:
Don't need to know all the particulars? Toggle them off for an even cleaner list.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Good built-in calendar
The calendar includes agenda, day, and three-day views.

Pro Integration with calendar and tasks
Quick conversion of a received email to a task with the deadline.
Pro Fun to use
clean and smooth experience, very nice and i like it.
Pro Smart lookup
Smart lookup is a feature where the Bing search engine is bundled in the app to allow users to automatically search for relevant websites, information and images based on the word highlighted by users, without need to open external browsers. The results will be shown on the right pane of the window.
Pro Priority messages
Microsoft Outlook comes with feature called "Clutter" to filter out incoming email based on the priority of the message set by user. User will be alerted when the high-priority message is incoming, whereas the low-priority message will be put in a separate folder.
Pro Attach files from cloud
Microsoft Outlook allow users to directly attach an attachment directly from cloud services without need to download an entire file before attach to the intended e-mail.
Pro VBA macros
Pro Conditional formatting
Pro Cloud
can attach files and use cloud, very good.
Pro "Executive Summary" toggle view
Don't need to know all the particulars? Toggle them off for an even cleaner list.
Pro So, so easy to add appointments
To add an appointment, you just need to tap them in. No long forms. No interpretation error of natural language. It's truly unique and superior to other calendars.
Pro Responsive developer
Responsive, friendly and helpful if you ever need to get in touch.
Pro UI is clean and sleek
It has been designed to show you everything you'd want to about your schedule on one screen. You don't need to tap through for address details, room location or for the title of your meeting. It's clean and easy to read too.
Pro Works with the main calendar for use on laptop/iPad
You can use iCal on your laptop and Rooster on your phone. The phone version of iCal takes longer to enter events and the UI isn't as streamlined.
Pro Beautifully easy to use
Standout design. This app makes staying simple. Very well thought out. Even fun to use.
Pro Roll over incomplete tasks
Any tasks you don't finish carry forward to the next day.
Pro Recurring events are the easiest to create ever
The keyboard entry makes it so easy to create repeating events.
Pro Pin board is great for floating tasks
Super handy for any tasks that you don't want to put on a date and just want to keep it around to be completed one day.
Pro No unnecessary complexity
Has everything you need, without adding bulk that you'll never use. Gestures and animations are just clean and intuitive
Pro Personal data is kept on the device only
They aren't trying to mine information from personal events and tasks.
Cons
Con It's from Microsoft
Con Rather buggy
Con Crashes frequently
The only issue with Outlook 2017 is that when the Mail folder increases in size, it sometimes crashes for no reason it, causing loss of data.
Con Categorize email IMAP not good
Con Frustrating user experience
The "Clean Interface" approach means that normal and necessary user interface elements have been removed, such as certain scroll bars, and even the "replied to" indicator. This program becomes more frustrating with each new update.
Con No unique Inbox / global folders
Con No portable bundle available
Con No aliases
Outlook does not support email aliases other then outlook aliases
Con The UI is outdated
Con Only available for Windows
Con Privacy Policy missing in app
It is unclear what they are doing with our data since there is no official policy posted on the website. UPDATED: It is available on their website
