Undo Send (10 second delay before sending) like Office 365 version
The online version of office 365 allows you to set a rule/setting that will allow you to undo a send for up to 10 seconds after hitting send. Please give that feature to the full version of Outlook.
Even better, can there be an automatic pop-up when hitting "reply-all" that says something like "Are you sure you want to reply all". Yeah, I did that. Entire company. Sigh. Lucky it wasn't mean or bad, just embarrassing.
Personally features should be common between Desktop (Outlook) & OWA (Outlook.com). If one does not apply to the other, then the feature should be greyed out and stated for OWA only or desktop only
Switch off the "Automatically Send and Receive" feature. That will force you to hit F9 before the email is actually sent. It takes 2-3 days to get used to it and it will make your life easier from them and on.
Robert Rose commented
I know this has already been proposed below, but seriously, implement it. It's probably the single best feature you can currently include. And if you have it in the browser version, I see no reason you can't have the same feature in the full version. I have tired setting a rule that delays sending for 1 minute, but a) the minimum delay period of 1 minute is way too long, and most important b) I have found that many emails sent under such a rule stay in the outbox and never get sent. The way an attempt to implement a delay using a rule functions is really dodgy and a huge danger to any business relying on email. So we need an explicit 10 second or so delay feature available.
Chaz Weber commented
I like the simple implementation of this in OWA and Outlook Mobile where I can just click a button to undo a message. Being able to undo has saved my neck plenty of times.
New Rule -> Apply rule on messages I send -> -> "This rule will be applied to every message you send. Is this correct?" -> Yes -> Defer delivery by "enter number of minutes" -> Finish
Excellent suggestion. Yes we can create a rule to do this, but no regular users have no idea how to create such a rule.
Ideally I suggest also providing a way to change the delay to anywhere from 10 to 99 seconds. But if that requires too many resources, just do the 10 second delay.