[Kadin]

Mostly Microsoft Outlook.

(But more seriously, even with a good MUA and either client-side or server-side search, the way mail messages are constructed, with tons of reply quoting, makes searching them a pain.)

In lots of business cultures there's no expectation to search email, because it's so hard to get useful results that way, so if you send it in an email you can expect to have people just ask you to send it again. Even if you can use search, it still sucks.

Slack is not perfect but it's at least designed for search.

[zo1]

MS Outlook's search is pretty damn good, I have no idea what you're talking about. It's not perfect, and definitely not "google"-like in terms of guessing what you're actually trying to look for, but it gets the job done.

[austinjp]

Perhaps I'm just too used to Gmail, but it always seems to take me forever to work out the equivalent of things like "from:me to:susan in:folder has:attachment".

And in outlook's web interface, this all seems to be even worse. Emails somehow just vanish. Not good.

[fstephany]

Search is one of the main reason why I ditched Thunderbird for GMail...