For me, I live in Outlook 99% of the time when my computer is on. Whether I'm at my day job, or at home, Outlook is almost always running.
I've been running Outlook 2000 for many years now, and have many, many, many messages in Outlook. Yes, I'm a packrat. I've heard there is a 12 step program for that, but I'm not enrolling at this point.
Anyway, I was running Outlook 2007 for a while, but found it to be very slow on my machine. I loved the multiple account in one profile setup, but the speed degradation on my machine was just too much to have to bear, so I went back to Outlook 2000.
Tonight, I got home from work, after softball practice (my two older kids made all stars, very cool), and after the girls had gone to bed, I fired up my laptop to check my email.
I started Outlook, as I normally do. And waited. And waited. I waited some more. Nothing.
Thinking that I had some kind of weird memory issue, I rebooted. After all the processes finished loading, I started Outlook again. Waiting. Waiting....
Nothing. Twenty minutes later, nothing.
For me, I'm an Outlook fanatic. I *love* Outlook. I've tried other clients. But I keep coming back to Outlook.
But this might be the straw that breaks the camel's back, so to speak.
I've installed Thunderbird. It has multiple account support. It supports multiple sending accounts (so I can send from myhomeoffice.org or fourangelsphotography.com). Very important.
It doesn't support two applications that I have used in the past and find very useful:
Newsgator - I was a beta tester of this product before v1, and had used it every since. It currently is on v2.6x .
Skylook - I was a beta tester for this product. It's pretty indispensable for Skype usage and works great with Outlook.
To get over my Newsgator addiction, I've switched to FeedDemon, which will read my feeds from my newsgator.com account and download feeds. It's certainly not as convenient as the Outlook integration of Newgator, but I think it will work.
For my Skylook needs, I'm not sure what I'm going to do. I've started looking at CallBurner, which will record Skype conversations just like Skylook will do. It works quite well, and I recommend it. It's not integrated with Thunderbird however. But it's a really well done application and I like it alot.
So, we'll see after a few days how my Thunderbird experience goes. I have high hopes. But I also have high expectations....wish me luck.