[douche]

I've never had an installation of Outlook that stayed stable and usable for more than about six months. It doesn't help that you have other parts of Office that stick their grubby fingers in your address books, calendars, and mail files and do their best to scramble things up.

[oblio]

I don't know what you're doing with it, but I've used Outlook for 2 multinational companies for 4+ years each, had several GB of mails for each (probably hundreds of thousands of email per account, most of them automated), and the worst parts of it were a bug with password resets (it keps asking for my password for about a week after quarterly resets) and the slowness of filter sync with Exchange.

As you can see, those were nuisances. Otherwise, it was pretty much rock solid.

Several versions, ran them under XP and Windows 7.

[douche]

Lync/Skype for Business tends to play havoc with Outlook data files, I've found.

[zhte415]

I get around 400 mails per day and over several years Outlook has not failed. Exchange environment.