Why not write up a...
The answer is simple: I haven't had to do them yet in the real world. I have been asked by a client to move Exchange --> Office 365. I spent a lot of time doing the research and writing up an internal document, it seemed like a quick-and-easy way to get a pair of sysadmin blog articles out with only some minor rewriting. Preferably sysadmin blog articles that might mean something to a reasonable chunk of my potential readers.
If and when I run across the need to document more things, I am sure they will find their way into these pages as well. (You can always go to http://www.egeek.ca and hire out my company to do whatever project you want. I am certain that if I have to do enough research/generate enough documentation to do that project, at least some aspect of it will end up rewritten in blog format here. Or, you know...ask me if I am willing to write an article on a given topic...)
In the meantime, you might like some of my previous articles:
SpamAssassin front-ending exchange: http://www.trevorpott.com/?p=275
Basic Linux bandwidth shaping: http://www.trevorpott.com/?p=308
I am working on documenting some of the tools I use with Google Apps (migration, maintenance, overcoming some of the missing features like shared contacts, etc.) I am sure that will eventually be at least one article.
Regarding the specific products you mentioned...the simple truth of the matter is that I haven't done a Zimbra migration in about 3 years. (I've done several "from scratches", but no migrations.) I haven't touched Scalix or Sogo in forever. I've never moved Exchange --> Postfix, though I probably set up a Postfix or Qmail server every week. (Virtualmin!)
As a general rule, I write an article when:
I have to do something new adn this creates documentation
I found something actually took some effort
Something interests me that I feel would interest my readers
As to being a shill...
There are only two vendors who have ever sent me demo gear to play with. Pano Logic and Intel. I’ve been a Pano fan for ages, so I never turn down the opportunity to play with their latest stuff. (I do have to send that back when I’m done.)
Intel once managed to get me a few 10GBe cards. This was in part so that I could do some tests for an article, but had much more to do with my attempts at the time to woo a customer looking at a 5000-node render farm deployment towards Intel’s gear and away from Brocade. (I was demoing Intel’s cards actually doing offload and not failing.)
In every other case, I have either had to buy the equipment myself, or (in some cases literally) beg local sysadmins for the chance to work with equipment they have on hand.
If you have a personal bias against Microsoft, fine. Have fun with that. But please don’t assume I am shilling for them. I abhor all megacorporates equally. With the sole exception of Intel – who once gave some previous-generation network cards to one of the marketing companies they retain to deal with resellers and the press, who in turn gave them to me – what have any of these companies ever done for me? (And frankly, I feel that is more on the PR company involved than Intel proper.)
I’m an SME sysadmin, man! I – and my entire customer base – don’t even exist to these companies!
Yes, The Register exists because of advertising dollars. Yes, some of those dollars do pay for my sysadmin blog. But my sysadmin blog receives zero direction as to content. Zip, zilch, zero. If it says “sysadmin blog” on the article, or it is in the sysadmin blog section…it is 100% the product of me, my two purring kitties (who insist on putting some the characters into the article by walking on the keyboard), the number 42 and the almighty coffee.
If you want me to write an article about a given topic…ask. I am not Dell or Microsoft. I am not some faceless megacorporate or untouchable journo who never engages with the readers. I’m just a guy, you know? I fix computers, I troll people on the internet and I write things on a blog.
If I have time to do the research, you’ll find I am usually willing to give it a try. I can’t guarantee that I’ll get around to it, but that’s only because I don’t have a “permanent” writing gig here on The Register. I get approximately one article a week, and I don’t know how many I have left.
If that still makes me a shill writing "advertisements", well…you’re even more paranoid than I am.