Don'ts

Weiqi Gao's Weblog - Weiqi Gao.com: "Don't make your user mad.
Don't make your user lose work.
Don't make your user change email client.
Don't make your user change email protocol.
Don't make your user reconfigure ssh client.
Don't make your user's email stop working.
Don't make your user's any application stop working.
Don't make your user's email become slower than before.
Don't make your user's any application slower than before.
Don't make your user's shared folders stop working.
Don't make your user's printing stop working.
Don't make your user's email stop printing.
Don't make your user's mailing lists change the way they work.
Don't make your user's ssh session timeout change the way they work.
Don't make your user's daily routines stop working.
Don't make your user's occational use cases stop working.
Don't make your user's different login profiles overwrite each other. "